Mario Kart Wii. I have played Mario Kart 64, Mario Kart Double Dash, and Mario Kart DS but Mario Kart Wii is my prefered choice. There is so much to do once you have completed it (I have Mii outfit B as well). Competitions, online races (with friends or with unknown people across the world or continent). Single player on Mario Kart Wii is fun as well. Mario Kart DS and Mario Kart Double Dash are online as well but they are fun in Multiplayer with people you know. The only thing I dislike about Mario Kart Wii is that Petey Piranha is absent from the game.

To conclude this post I will list my top three favourite tracks from the Mario Kart franchise:

1) Maple Treeway (Wii)

2) Daisy Cruiser (Double Dash)

3) Mushroom Gorge (Wii)

Double Dash (because of specials), DS (missions, battles and online) or Wii (tournaments, online, 12 players)

I've played all of them apart from the original, and have voted DS as my favourite. It's close between that and the Wii version, though.

MK:DD was my favourite. I've played Wii, DS and DD.

but I liked a lot of the circuits in Wii. And the Rainbow Road in both Wii and DD rock. ♥

You are awesome.

If MK:Wii wasn't out, I'd pick MK64. Those tracks actually felt like real ones, not something short you would find in amusment parks!

I love Rainbow Road in Mario Kart Wii.  I'm glad I'm not the only one :)!

It's better on Wii because you're actually "driving" 

Mario Kart Wii is better than all of the others put together times seven. I could write a thread about it and maybe will soon. Right now I'm too lazy.

MK64. Multiplayer perfection in racing. So many laughs. MK Wii a close second though.