For the time being, expect more-or-less the same from both the 360 and PS3, though the online play is better received on 360. Basically, most of the games are the same. Gran Turismo 5 Prologue comes out next week, though, as well as Metal Gear Solid later in the year.
If you are a visuals guy when it comes to movies, PS3 will have better experiences with the built-in Bluray player.
If you have friends and family play games with you a lot, the Wii would probably benefit you the most, but I think it gets boring after awhile of single player games. They're difficult to find still, though.