I got my 360 because it had the games I wanted to play (Halo 3, Gears of War, Bioshock, Fable 2). I soon discovered some old friends had 360s and were easily added through messenger which was a cool bonus.
PS3 is probably a better made machine, its more reliable than the 360 and a good deal quieter, but its lack of games and cost can be off putting to many or the mainstream.
Best way to judge is which console has the games you want to play?
What have your friends got?
Cross platform games are not largely different on PS3/360, the 360 usually coming out on top if you were to not pick through the details.
If you must have MGS4 or Gran Turismo then its a PS3 for you.







