Ultimate versions have a more human look, bodywork is slimmer and more believable to have balance. In the older versions Wolverine sometimes looked like a musclebound grotesque. I can't say that I don't liek the muscle detail and all that, but it does sometimes look out of proportion doesn't it?
My list is:
Wolverine
IronMan
Spiderman
Carnage
Black Panther
Hulk
Magneto
Gambit