I'd like to maximise my current fire team's damage and debuff management. Which has better output?

A.) D'artagnan w/ +20% atk A, Nergal (-10% def A)
B.) D'artagnan w/ -20% def A, Baphomet (-10% atk A)

Currently this is the only team I can afford:
D'artagnan w/ +20% atk A
Amaterasu
Agni
Nergal
Amon