Considering HOMM6 is full of crash errors and spent six months virtually unplayable if you had Nvidia cards I'll take the simpler animations with lower system requirements and less places to go horribly wrong.
Though on the animation note, I'd definitely appreciate if a few of the animations went a bit faster--the first couple rounds of combat if your guys have slow attack or walking animations can be really sort of tedious, and while on it's own it's over quick, it can be a problem when you're doing like, twenty fights in a short period.