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 did the exact opposite. I played my PS3 for a couple years after my PS2, then all my friends started getting XBOX 360, so I made the switch and have stuck with Microsoft ever since.