The good ol' NES and SNES ones are ofc the best ones, but I voted for 64.
I actually do not own any of the other games from this vote than Galaxy, but I have played 64 and Sunshine and 64 is win Galaxy is just a bit too easy in my opinion, also it happens in space... Not a fan of Plumbernauts.
I have two SNES and 1 N64 but I can't decide which Mario I like better. I own all of them for SNES and I have Super Mario 64. But I will choose Mario 64.