My two cents as owner of all three.
PS3
Pro
- Some solid exclusives (God of War, Uncharted)
- Some unique titles (Demon's Souls, The Last Guardian)
Cons
- Pad is shit for play all genres
- Shoulder buttons are epic fail
- Analog should be set as in X360's pad
- Almost all the multiplatform titles are better on X360 (even considering pad)
- Online sucked for years and now is just decent
- A few people use online chat because of the headphones = epic fail
- No multi games chat (*)
(*) I mean the feature you have in X360 that I can play Fifa and talk to friends that are playing Halo and Top Spin
WII
Pro
- A few (!) really really awesome games (Mario Galaxy 1 and 2)
- Some unique titles to enjoy the Wiimote ( the best one is by far Trauma Center Serie, on of my best ever)
- Many solid titles (Metroid, Donkey, Mario Kart, Twilight Princess)
Cons
- Excluding Zelda Skyward Sword console is dead
- No HD
- Graphics were usually shitty and rarely good looking (Mario Galaxy 2)
- Online sucks badly
X360
Pro
- You love online playing? X360 is your console. No doubts.
- Best pad of the generation. Why should I drive my Ferrari using a handlebars (PS3) when I can use a Momo Wheel (360)?
- Multi games party chat (explained before)
- Almost all the multiplatform titles are better on this console (considering the strenght of the online structure and the quite perfect controller). Don't understimate those games because we love playing BC2, Fifa, NBA,.... and we prefer to play them on the console that offer us the best experience)
Cons
- RROD (but nice assistance)
- Just a few exlusives (Halo, Forza, Gears,...)
- Microsoft bet too much on Kinect and this 2011 is going to be full of useless titles
Easy choice then, my winner is by far Microsoft X360.