| Here are some of my criteria:
- Generally, I look at the PS3 version first since I much prefer the (far-superior, AFAIC) controller, and, indeed, my 360 sounds like a plane taking off when a disc is in the drive. My PS3 is silent. (It's also more reliable.)
- If the game has a heavy online play component, it'll always be the PS3 version for me. I had Xbox Live for a little while, and it's nowhere close to being worth paying for (especially when you get it free everywhere else).
- If the game is mostly a single-player game (eg. Fallout 3) and has exclusive DLC, I'll get the version with the DLC (like 360 version of Fallout 3).
Overall, my 360 almost never gets played. | 
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