I own a 360 and a Wii, but I use my PC for gaming more than anything.
I agree with the above posters: for non-exclusive games, you're going to get the same games on the PS3 as you would on the 360, especially fighting games.
LoZ on the Wii/GC was an amazing game and I highly recommend it. Super Mario Galaxy is a great platformer as well - on par with Super Mario 64 IMO, and as stated above SMG2 is coming out.
Plus, it's really easy to modchip a Wii, if you have any interest in that sort of thing.