I call BS...
-With neither version offering anything over the other (we're discounting the motion control in the PS3 game as it's not worth using).
-Much has been made of the pop-in seen in the Xbox 360 game, but it's a minor problem that most gamers won't even notice.
Finally, look at the comparison video, specifically the helicopter ride. You can see how the water glissens on the PS3 version but not the 360's. Lighting is much better for the PS3.
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