Classic or remake? That depends on the remake of course..
I prefer Mario All*stars to the Mario Advance series. The added voices and changed features do nothing for the gameplay, which in itself is classic (Mario Advance 4/SMB3 gets bonus points for E-reader options, and SMA3/Yoshi's Island loses points for adding Yoshi's annoying voice to an otherwise great game..)
When most people think classic, they think of just NES games, but there are other classic games out there that are on other systems too. (Super Mario 64, Super Mario Kart, etc..)
I think I prefer the original versions of most games, though the remake is good because I often can't play the original (mostly just NES games, here..)