@ Roushimsx: I remember playing both back in '99 - '00 and it seems like there were other subtle improvements as well. Been a while since I've played either but the PS was just too RAM poor to run any fighting games well IMO. The good old Dreamcast though was a true fighting game machine.
I never knew about the sprites on top of polys thing. I always assumed they were just regular old sprites. It seems redundant to have unseen polys underneath 2D sprites. What was the benefit of this approach?