Both Console has awesome graphics and impressive performance but it's depends on your personality and taste. but here's my advice i can share it..
For PS3 = if you have a lot of money to throw to buy Original Games then go for it!
For Xbox 360 = if you want to play practical and money wise then this is ur choice bcause of Jtag.
As i said they are both had awesome performance, we can say that PS3 is more advance than Xbox 360 because of Blu-ray Player but that's not a Big Deal to say that PS3 can kick Xbox 360 A*s in terms of Graphics and Performance. what Xbox 360 good for people who can afford to buy Orig. Games and there choice is to modified their Console in able to Play Games for Free.