Does the 360 have games with better visuals? Yes.
Does the PS3 have games with better visuals? Yes.
So........what is the point of comparison? To me, it looks like a thinly veiled attempt to somehow establish some kind of superiority one way or the other. The fact that some people will try to go about this in an "intellectual" manner is irrelevent since at the core, this is nothing more than a childish game of 'mines bigger/better than yours'.
Of course, one will say "But what if I'm a multi-platform gamer and want to choose the best version"? Well, I say that's bullshit.
360 wins this simply on the grounds that its framerate is stable and all else is negligible either way. Doesn't mean anything else other than that. Let's get real.