Oh so if you can finish 12-5 then that is the better choice? Well that's good to know, I was doing both of them intermittently.
Well to be short your gonna get way less manyus out of farming 12-5 over 1-3(or 2-1 w/e) but you'll be getting a lot more seeds, coins (maybe? not sure), and better bosses. I farm 12-5 most the time if I don't have anyone I need to evolve/lvl up very quickly. Also its much faster to blow through all my stamina if I don't want to play a lot. The big thing is 12-5 will result in you being much more coin efficient in leveling your girls since the gold manyu's give so much more xp.
I meet halfway and farm 10-3 most of the time. It gives 507 stamina points, about 500-600 normal gacha seeds, and triggers the SG for 50 stamina quite often. You can get lvl 100 manyus in that SG too.
12-3 is easier to collect all the treasure so better amp odds slightly
12-5 is more gold/seeds/xp per stamina I think
1-3 is fine if you want low level manys
I find the secret garden rate is about the same between 12-5 and 12-3. 12-3 takes less stamina and is better if you're only interested in manyus but 12-5 gives a lot more gold and seeds, and a higher level raid boss.
As for farming 12-5, I've found one really strong squad will go a lot further than several fairly strong squads. If the squad doesn't reach a certain level of power it will just be destroyed or crippled by the threestepper nodes. On the other hand one 100k+ team with Edelweiss and Lavender for sustainability and a slice type or 2 can clear the map on its own.
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