I just realized that the only reason I got the 360 before I got the PS3 was because it came out first. Before last gen I played my PS2 more than my Xbox, and all of my friends had a PS2, but only a few had an Xbox.
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I played my PS2 more than my Xbox (my Xbox was a Halo/Morrowind machine). I got the 360 because that's where Bungie's games were going to be. I still played other games but missed out on a lot because I didn't get a PS3 til the tail end of the console generation.