Most stamina efficient stages for farming?

[HakuYowane]

Backthen 12-5 and 12-3 were the best stages (that gave a 80 stamina bonus level) for farming in general.

Since the big update the layout for these stages have changed and new stages have been coming out, are these stages still the best for farming or are any of the new ones any more efficient?
(I am playing on nutaku but also interested in dmm)

[MagicSpice]

i think it was 1-2 or 1-3... but one of those was efficient for something... either coins or exp I think.

(and actually, the event right now gives bonus stages at no cost for coins and exp, which is the best we got for the time being)

[Mraktar]

Backthen 12-5 and 12-3 were the best stages (that gave a 80 stamina bonus level) for farming in general.

Since the big update the layout for these stages have changed and new stages have been coming out, are these stages still the best for farming or are any of the new ones any more efficient?
(I am playing on nutaku but also interested in dmm)

Why 12-5 (40 st) and 12-3 (35 st) and not 12-1 (33 st)? Is there increased chance of ampies or something else that i don't know? i'm interested in this answer too.
1-3 is good only for exp grind, but 12 chapter has ampies in loot.

[Taon]

Why 12-5 (40 st) and 12-3 (35 st) and not 12-1 (33 st)? Is there increased chance of ampies or something else that i don't know? i'm interested in this answer too.
1-3 is good only for exp grind, but 12 chapter has ampies in loot.

All the stages in Mission 12 can give ampies. 12-1/3/5 were the ones most often run for varying reasons, 12-1 for pure ampy farming (best stam:ampy ratio), 12-3 for more exp than 12-1, and 12-5 for more exp/gold/seeds. 12-2 and 12-4 gave less gold than 12-1 and had worse RNG than the other 3 stages.