Well, if you have the money, go for the PS3...
The games are more expensive though, and you could a Wii and a few good games for the price of a PS3.
The Wii has Fire Emblem, Metroid, Zelda, Smash Bros, Mario Galaxy, Okami (although that is also for the PS2)...
But the PS3 has inFAMOUS, Soul...