Sony PS3 vs. Microsoft XBox

I am the proud owner of the Sony PS3 but lately I have been debating on getting an XBox.  I don't really know too much about the XBox but I hear a lot of great things about it.  In the past, I have used my PS3 to mostly watch movies.  I just started to play games on it.  I got Modern Warfare 3 for Christmas and have been addicted to it ever since.  My brother also got the game but he has it for the XBox.  I tried playing it on his system and I did notice that the controller is much more difficult to use than the one for the PS3.  I also like the fact that to play online it is free with the Playstation.  Besides these simple fact, I don't really now too much more about either system.  I need some help!!!

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