I prefer a PC. Free internet, I can do more things at the same time and in overal I am just used to PC gaming. I do have a Xbox 360 though, but as you have to pay for online and I am not paying for it atm, I bairly use it
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But when you compare the Xbox and the Playstation, I think I'd say Playstation, not looking at stats etc. but just the free internet and the fact that, atleast where I live, more people go for the Playstation. I do prefer Xbox controlers though.