Ah btw, for those farming SG for manyuus
1-3 (9 stam) is the hands down best map for gold (not exp) if you are farming SGs, it also gives you the most number of tries for SG in a single stam bar (you can run quite alot of 9 stams) but is also the most painful (you can run QUITE alot of 9 stams

) to do constantly.
2-1 (12 stam) is the 'even' map for exp, but not good for gold. it's exp ratio is level with SGs (11.116/stam)
5-4 (28 stam) is the best exp ratio map to get tier 1 SGs, once you go past stage 5, it will start pulling tier 2 SGs (50 stam). It gives 12.786/stam. The drawback is that if you are mainly doing this to pull SGs, you won't get as many runs.
The reason 1-3 is the best for gold is because the map has only 1 RNG spinner and 9/10 times you will get all 3 chests which are almost always girls (very occasionally 1 gift), which means +750 gold per run. The average gold on 1-3 is 800, so the grand total is 1550 gold... quite phenomenal for 9 stam, it's almost on par with the saturday 50 stam gold rush daily.
Paired with SG that is 12 stam for an average of 1500 gold, you can make a pretty penny.