For the most part, they're nearly indistinguishable, on some games the PS3 does better and on some the Xbox 360 does better.
On some, the Xbox 360 blows the PS3 out of the water. I've noticed that most of the time the PS3 seems to use lower resolution bitmaps. Just look at Gran Turismo 5.
If you'd like to post evidence to the contrary, you're welcome to.
god, you are so wrong. if your talking about multi-platform games, then yes the 360's graphics are better in that department and ive allready stated why. look at red dead redemption for example, on 360 it could go to 1080p, but on ps3 it was only for 720p. the reason for this is because of what i stated before, the 360 cannot support the type of graphics ps3 can, so pretty much 360's 1080p graphics would look like 720p on ps3, but if you were to take EXCLUSIVES, and compare them 1v1, the ps3 would come out ontop. like say, halo3 vs resistance 2. or gears vs killzone 3. or forza vs gran turismo 5. or better yet, all the 360 exclusives vs uncharted2. uncharted 2 truly symbolizes the ps3's potential in graphics. and we're still getting BETTER graphics. like i said the only thing the 360 has over ps3 is multi-platform gaming. other than that the ps3 is the better machine hands down.