Depends do you like online play? Then 360 is for you. Though you have to pay it's worth it. I played PSN at my friend's house (who has all 3 systems & prefers 360) & PSN sucks compared to 360. Too many quitters with no penalty (rank going down, etc...).
The only reason I could see myself getting a 360 is for Blu-Ray (which the next Xbox will get) , MGS4 (Which could be like FF & be ported), Uncharted & Little Big Planet.
Also, I'm not an Xbox fanboy. I had a PS1, N64 & PS2 & loved them. But 360 has more to offer(better exclusive games & online play) than PS3.