Well, what I like about the snes ones is the simplicity of the game, not that complexity is a bad thing but in this case it makes it a very polished game. It lets you focus on the gameplay and you are not distracted by other things. Although I think the X4 is the most enjoyable of all the psx/ps2 ones.
RE: Schattenjaeger's Previously Owned Reviews #9: Mega Man X4 - Some Say the Last Good X Game, and Possibly Even Better Than X1, but Do I Agree?