Which is better, PS3 or Xbox 360?

I got the PS3 for Christmas, and a PS3 Bluetooth, and the PS Move pack, and a PS Move controller charging dock, and Call of Duty Black Ops for PS3. I didn't have a PS3 or Xbox before Christmas, I had originally asked for PS3 but now I'm reconsidering. Should I keep the PS3 stuff or exchange it all for Xbox stuff. Nothing has been opened so it can be returned. And don't say I should keep the PS3 stuff because they were gifts from family or because I already have all of it, I want an honest opinion or facts about the better system