auto-regen is way enough. dont even bother with auto-potion, you waste your money. also, in boss fights like Kuja and Necron, auto-regen heals your characters by the time Dagger/Eiko can use curaga, so if you want one of them just-in-case, use Dagger cause she has more attack options, and i find her physical attack a bit stronger than Eiko's, and that's not beacause of levels/weapons (on my data)