I don't really "get" all this HDTV nonsense, but it says here http://www.xbox.com/en-GB/games/c/chromehounds/ that it runs at 1080i, and since that's a bigger number than 480 I can only assume that that answers your question.
I own R6 and SC (only played a little bit of G.R.A.W. with a friend) so I can only suggest either of those two. If you're more concerned about the multiplayer then it really depends what you want as they're very different. SC multiplayer is a cat and mouse spy vs. mercenaries affair and R6 online plays more like a typical shooter.
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