I only own a PS3 but I think xbox is pretty good too (especially for live). Not a huge fan of the wii however.
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I have no experience with the PS3, but enjoy my two 360's. Also have a Wii, it was fun for three nights...
the 360 has kickass games and all, and assumably so does the PS3, but honestly the wii is just so revolutionary and offers something no one else really successfully offered that it's gotta be top pick.
I'd say PS3 is the best, free internet, lots of space, sleek design, good games.. but I personally love xbox simply because I've had it the longest and used it the most.
I own all of the above and I enjoy my PS3 the most and use it the most. Each serves fits into a different niche though, you can't really compare a Wii to a PS3 because of the completely different target audiences.