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 probably played on the Xbox more than the PS2 towards the end of that generation, so I would have bought a 360 first either way. It was about 2009 before I eventually got a PS3.