Some say Xbox and some say ps3. Myself I play both but like xbox 360 better because, the live is Simpler even though you have to pay for it. Pretty soon xbox 360 will have internet like Ps3 so it will have nothing on the 360.
7 out of 10 will say Xbox, I still don't know why though. I personally prefer PS3 because while the community may not be as big as xbox, it is still large enough to offer all the options in games that I could want and it is free. I know people will say "oh, but Sony got hacked and Microsoft will never be hacked," but really microsoft can be hacked too, it just hasn't happened yet.