Well ... To bring this discussion back to reality ...
The thing the GameTrailers (and all comparison) videos point out is the same thing that I have noticed in real life; the difference between the graphics of the XBox 360 and PS3 is small and you probably won't notice any difference unless you're looking at the games side-to-side. Personally, I don't notice much of a difference between my XBox 360 hooked up by component displaying 1080i and my brother's PS3 which is hooked up through HDMI and displaying 720p (I believe).