Look over the tire and between the fence. There is more debris/object in the 360 shot and than the PS3 screenshot. And no, this has nothing to do with the angles. Both are looking at the same area.
Btw, it's funny to see people downplay CoD4 since it's cross platform but Halo3 was being slammed left and right.
The only difference there is that PS3's shot seems to show more texture detail and normal mapping farther while 360's seem to have better textures up close.
Everything else is identical minus the soldier on the 360 shot