Hate the wii. It's for old people and kids.
PS3 is probably better than the three-shitty, but so far most of the games I've wanted were also for the X360 anyway (like Oblivion, Assassin's Creed, Mass Effect, Halo 3, Bioshock, etc.) and future games (like DMC4 and GTA4) seem to be going down the dual-compatible route. As long as MGS4 isn't ps3-exclusive, I should be able to avoid touching one...