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To keep this one strait we are looking at the armour only here, not the soldiers that wear them (it is assumed that a normal person is wearing them, despite such impossibilities) or their other equipment or their respective enemies. So without further addo:
Mk VII "Aquila" Power Armour:
Few things are quite as rediculous as the sight of space marine power armour in its proper proportions. Despite its massive size it has suprising agility and does not hamper its user, unless you want to raise your arm above you're head I assume. Its got sundaries up the ying yang: Enhanced strength (roughly double), visual and audio filters and enhancements, virtualy limitless life support (including waste recycling), medical enhancements, magnetised boots and recoil supression systems for weapons. On the downside its bulky fingers have comparitively poor manual dexterity, unless using specialy designed tools.
As for actual armour it is practicaly invulnerable to many forms of civilian weaponry even within the similarly rediculous 40k universe, although military grade small arms (the stuff that the weakest of easily severs a limb) is capable of penetrating its weak spots. By todays comparison this probably ranks the armour as a form of light tank.
Mk 6 MJOLNIR Powered Assault Armour:
The much more sensible Mjolnir armour has considerable improvements in strength, agility and reaction time. The largest strengths of the armour though is the shielding system which is capable of absorbing multiple shots from small arms fire before needing a few seconds to recharge. Other suit systems include audio visual enhancements, motion sensors and life support.
The suits protective benefits dreive from its mutliple layers of titanium and padding which provide excellent protection from small arms fire although the more powerfull covenant energy weapons are capable of punching through with several impacts.
Comparison:
While the differences between various universes not to mention real life can be hard to manage, I'll do my best.
Protection: The difference here tend to be in favour of the space marine power armour, which offers superiour coverage of its plating and that its massive ceramite plates are virtualy invulnerable to infantry weapons. By comparison the Mjolnir armour, even with its shields, cannot withstand sustained assault rifle fire (because... you know all armour should be able to do that) although concievably its regenerating shielding could reduce attrition damage to the armour over long periods (once again though, by comparison to the sheer strength and thickness of the space marine armour, it would be a very long period). Further more the Mjolnir armour relies on its shield to protect many parts of the body where its titanium plates do not cover and once that shield has gone those areas become vulnerable (by comparison to where it has armour, the titanium nanocomposite bodysuit alone is probably better protection than a kevlar vest). While space marine power armour has its own weaknesess, the insides of its joints, these are significantly smaller than those of the Mjolnir armour.
Maneuverability: Obviously it would be stupid to rank armour based solely on how thick plates are and while such heavy armours would typicaly be very limiting to the wearers agility, both actualy perform very well here. Over all the Mjolnir armour performs better here as it has features that increase reaction speed and the space marine power armour relies entierly on the user's speed, even if it does not hamper them. Similarly the seperation of plates allows for a greater range of movement in Mjolnir armour where as the space marine armour has areas of restricted movement (thanks stupidly oversized pauldrons).
Medical Facilities: Both the space marine power armour and the Mjolnir armour have onboard medical facitlites. The space marine version being more centered around a limited supply of drug administration (as the marines body is perfectly capable of doing the staunching and healing on its own, but those aren't relivent here). The Mjolnir armour on the other hand relies on a medical foam to administer biofoam that is apparently quite painfull but with my limited knowledge of medicine tells me is probably better than just pain killers and stimulants and anti-toxins. However while the biofoam will allow a person to survive bleeding out, medical attention is still required to actualy heal the wound, and will not help in case of poisons or toxins (although its likely that the only actual toxins catered for in the limited supply of drugs are things that are dangerous to space marines, which is the sort of thing that would probably liquify a normal person and hence be useless).
Comunication and Sensors: While both have all the same basic functions as each other, the Mjolnir armour has vastly superiour computing power to use that information. In adition to this the motion sensor is a massivly usefull feature.
Sundary Abilities: Most of the other systems are life support, where the only difference is that space marine power armour will run for as long as the reactor runs (basicaly forever) and the Mjolnir armour has limited durations. Both are capable of filtering air and removing toxins from the atmosphere however the features of the Mjolnir seem more failsafe and have greater redundancies (once again, the greater protection of the space marine power armour would make it harder to damage the systems in the first place but rely on the marines natural advantages to survive faults). Similarly both also feature magnetic holsters for weapons and equipment. The only other difference in systems is that the Mjolnir armour is capable of locking down to prevent high impact injuries and a system of hydrostatic gel to help the wearer survive high G situations and impacts. the Space Marine Armour has magnetic boots.
So thats my run down of the two different power armours. I'm sure there are some things i've got wrong and you've all got opinions on what you would rather go into battle in. Have your opinion and cast your vote.
Mk VII "Aquila" Power Armour:

Astartes power armour is the high standard against which other forms of Imperial protection are measured. The commanding sight of the God-Emperor’s warriors in their iconic battle gear has routed more than one enemy force without firing a shot. Heavy ceramite plates form the basis for most suits, actuated by electrically motivated fibre bundles that replicate the
movements of the wearer and enhance his strength. Not only are Adeptus Astartes patterns the pinnacle of power armour technology, but a Space Marine’s unique interface implants ensure that his armour responds with the speed and precision of his own body. Each Battle-Brother is responsible for the care of his own suit of power armour, the components of which may have served his Chapter for millennia before him. Astartes power armour contains many complex sub-systems, and it is the synergy of advanced technology with Space Marine physiology that makes a Battle-Brother in power armour so deadly.
Few things are quite as rediculous as the sight of space marine power armour in its proper proportions. Despite its massive size it has suprising agility and does not hamper its user, unless you want to raise your arm above you're head I assume. Its got sundaries up the ying yang: Enhanced strength (roughly double), visual and audio filters and enhancements, virtualy limitless life support (including waste recycling), medical enhancements, magnetised boots and recoil supression systems for weapons. On the downside its bulky fingers have comparitively poor manual dexterity, unless using specialy designed tools.
As for actual armour it is practicaly invulnerable to many forms of civilian weaponry even within the similarly rediculous 40k universe, although military grade small arms (the stuff that the weakest of easily severs a limb) is capable of penetrating its weak spots. By todays comparison this probably ranks the armour as a form of light tank.
Mk 6 MJOLNIR Powered Assault Armour:

The armor's outer shell is composed of a multilayer alloy of remarkable strength and has been augmented with a refractive coating capable of dispersing a limited amount of Covenant energy weapon strikes. The suit contains a gel-filled layer underneath a thick black armored bodysuit. The gel layer regulates temperature and can reactively change its density. The inner skinsuit is made of a moisture-absorbing synthetic material linked to an environment control computer and the occupant's UNSC-issue neural interface.
Between the external armor and the internal padding is the most devastating weapon the suit carries: a layer of reactive metal liquid crystal. Woven by molecular tools into a superdense optical computer memory, this revolutionary crystalline layer forms a network, capable of supporting the kinds of Artificial intelligence usually reserved for starships, as a type of piggyback system. An A.I.'s personality and processing matrices can be carried by the armor and delivered to the suit via onboard storage in a crystal data chip no larger than a personal credit card. At the same time it is amorphous, yet amplifies force, doubling lifting capability and increasing reaction time by a factor of five.
The much more sensible Mjolnir armour has considerable improvements in strength, agility and reaction time. The largest strengths of the armour though is the shielding system which is capable of absorbing multiple shots from small arms fire before needing a few seconds to recharge. Other suit systems include audio visual enhancements, motion sensors and life support.
The suits protective benefits dreive from its mutliple layers of titanium and padding which provide excellent protection from small arms fire although the more powerfull covenant energy weapons are capable of punching through with several impacts.
Comparison:
While the differences between various universes not to mention real life can be hard to manage, I'll do my best.
Protection: The difference here tend to be in favour of the space marine power armour, which offers superiour coverage of its plating and that its massive ceramite plates are virtualy invulnerable to infantry weapons. By comparison the Mjolnir armour, even with its shields, cannot withstand sustained assault rifle fire (because... you know all armour should be able to do that) although concievably its regenerating shielding could reduce attrition damage to the armour over long periods (once again though, by comparison to the sheer strength and thickness of the space marine armour, it would be a very long period). Further more the Mjolnir armour relies on its shield to protect many parts of the body where its titanium plates do not cover and once that shield has gone those areas become vulnerable (by comparison to where it has armour, the titanium nanocomposite bodysuit alone is probably better protection than a kevlar vest). While space marine power armour has its own weaknesess, the insides of its joints, these are significantly smaller than those of the Mjolnir armour.
Maneuverability: Obviously it would be stupid to rank armour based solely on how thick plates are and while such heavy armours would typicaly be very limiting to the wearers agility, both actualy perform very well here. Over all the Mjolnir armour performs better here as it has features that increase reaction speed and the space marine power armour relies entierly on the user's speed, even if it does not hamper them. Similarly the seperation of plates allows for a greater range of movement in Mjolnir armour where as the space marine armour has areas of restricted movement (thanks stupidly oversized pauldrons).
Medical Facilities: Both the space marine power armour and the Mjolnir armour have onboard medical facitlites. The space marine version being more centered around a limited supply of drug administration (as the marines body is perfectly capable of doing the staunching and healing on its own, but those aren't relivent here). The Mjolnir armour on the other hand relies on a medical foam to administer biofoam that is apparently quite painfull but with my limited knowledge of medicine tells me is probably better than just pain killers and stimulants and anti-toxins. However while the biofoam will allow a person to survive bleeding out, medical attention is still required to actualy heal the wound, and will not help in case of poisons or toxins (although its likely that the only actual toxins catered for in the limited supply of drugs are things that are dangerous to space marines, which is the sort of thing that would probably liquify a normal person and hence be useless).
Comunication and Sensors: While both have all the same basic functions as each other, the Mjolnir armour has vastly superiour computing power to use that information. In adition to this the motion sensor is a massivly usefull feature.
Sundary Abilities: Most of the other systems are life support, where the only difference is that space marine power armour will run for as long as the reactor runs (basicaly forever) and the Mjolnir armour has limited durations. Both are capable of filtering air and removing toxins from the atmosphere however the features of the Mjolnir seem more failsafe and have greater redundancies (once again, the greater protection of the space marine power armour would make it harder to damage the systems in the first place but rely on the marines natural advantages to survive faults). Similarly both also feature magnetic holsters for weapons and equipment. The only other difference in systems is that the Mjolnir armour is capable of locking down to prevent high impact injuries and a system of hydrostatic gel to help the wearer survive high G situations and impacts. the Space Marine Armour has magnetic boots.
So thats my run down of the two different power armours. I'm sure there are some things i've got wrong and you've all got opinions on what you would rather go into battle in. Have your opinion and cast your vote.