SNES version. It is the most challenging and the most fun. I hate the N64 one because when I fist started playing it I was playing against people who owned the game and beat me anyway and they still used the shortcut. Then I would kick their ass at Smash Bros. or Mario Tennis so it evened out in the end.

Wii, because it's the first and only Mario Kart I've played.

I loved the Wii version at first but now I hate it so so much I almost feel physically sick anytime I have to play it. It's like a boredom nightmare. But I can't even remember the previous versions to say which is my best. All I know is I can't stand the Wii version.

OT: Speaking of Mario Kart is it just me or do others find the Wii tracks really dull. I think I prefer all the classic tracks on Mario Kart Wii to every one of the new tracks apart from Wario's Goldmines. Can't think of any other new track that I find even remotely enjoyable. Koopa Kape, Coconut Mall and Mario Circuit I can just about manage. My favourite tracks in the game seem to be the ones from N64 (Sherbet Island, DK's Jungle Parkway, Bowser's Castle, Mario Raceway).

N64>>>>>>>>>

Wii>>>>>>>>>>

DS>>>>>>>>>>

SNES>>>>>>>>>

GC>>>>>>>>>>>

GBA

The N64, not only because of the epic shortcut, but because when a shell found one of your friends, they had a high chance of flying off the stage and lose LOTS of time.

You're just mad because you got the neutered PAL version of MK64 while the rest of us got the working one.

Mine is Wii version, I love the music and all the elements in the background (planets, stars...) It's also very challenging with the wheel.

Second, the N64 version, seeing all your friends flying at the same time to take the shortcut, and how some fail while others succeed was awesome!

Third the Snes, it was extremely difficult but rewarding.

Hahahahah yeah! That along with the music made the track awesome.

Are people forgetting about the dogs in the N64 version? Those were sometimes hard to dodge, and added a bit of a twist to the stage.

They weren't dogs, they were chain chomps munching along the track.

The music along with the neon character signs were really what made the 64 track awesome though.  I'd play that course just to listen to the music.  ^_^

N64>Wii>DS>>GC>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>GBA