I am not sure about the Wii, from the little i know the games are going to be very active. If you watch the play demo you'll see what I mean.
http://www.play.com/Games/Wii/NAVSUB/5-/RegionHome.html
These type of games are great for about ten minutes when you first play them and then you get either pretty bored or knackered. I bought a steering wheel many moons ago for gran turismo on the old PS but after a while I wanted the joypad back.
Wii novelty factor is very high but long term I prefer to sit and play for hours not in 10 minute stints at golf or alike and then want a breather. If it comes with more conventional games then I'll think again. If anybody else has other useful links I'd be interested.
Just realised that I'm going on about the Wii...so getting back to the PS3 I think its a case of more of the same but better graphics/speed/etc etc which is what Sony are good at, so at the mo I'll plump for this.