I have both the wii and the ps3. And the wii wins.
The ps3 is just an upgraded ps2. and thats not a bad thing. the ps2 was one of the greatest consoles of all time. but is it worth buying one now? no. the games aren't here yet and playing resistance is good for the first 50 times.
the wii has better gameplay, more fun and with games like resi 4 and warioware, the wii is taking my time more than sonys very fat black lump