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In my opinion its safe to say so because you got to consider a prominent developer's opinion three years back. They released Indigo prophecy on Xbox. This is not an opinionated reply. But an attempt at clubbing facts together, Here are the words..
"I think this game can only be done on PlayStation 3,"
"We used all the SPUs, [and] I think to do the visuals, and all the stuff we're doing would be too difficult [on the 360].
"There are amazing physics there, and stuff with crowds that you just couldn't really get."
The Quantic Dream boss, non other than David Cage who introduced Kara lately.
Heavy Rain, a justified PS3 exclusive.

http://www.play.tm/news/24644/360-couldn-t-handle-heavy-rain-cage/