Hm, how about we not make a comparison thread based on blatant generalizations.
Better yet, why make a comparison thread between the ps3 and 360's flagship exclusive shooters in the first place. If you're simply trying to determine some sort of consensus on the best shooters on the market, you'd surely include more than just these two, correct?
And given that these two shooters are markedly different in style and are on two competing consoles, I can only assume your decision to make a thread dedicated to these two games came from the hope of spurring some sort of fanboy pissing content in which your preferred game would win out.
I would say this thread was a...
Oh, two choices! Can you guess which one I'm thinking of?