SNES without a doubt.
NES generally was a little too blocky to confidently represent things, so everything tended to look a little abstract.
SNES was good enough to have high quality sprites resulting in games like LttP, the DKC games, etc. And every generation after that has games that still look fine graphically. Yes, that includes the N64, thanks to games like BK/BT, OoT/MM, and Pokemon Snap, all of which still look fine to me.







