Not trying to start any wars here but I currently have both PS3 and 360 versions of Dead Space, I started comparing back and forth and I prefer PS3's color pallet and slightly darker gamma, it gives it more of a proper look (Even after messing with the in game brightness PS3's still seems a little better with shadow details).
Also for some reason when looking at the in game Brightness calibration screen on 360's the last 3 bars to the right are almost the same brightness (aka White crush) Yet on PS3's the last 3 bars are easily seen with no white crush issues.
So I step out of the wrecked ship and start heading to the Ishimura and noticed a strange effect with PS3's shadowing ... Instead of having gradually smooth shadows PS3's shows large bands instead .. I recorded a video to show what I mean, My camera is pretty much fail at video (640x480 @ 10fps with no video / ISO adjustments available) but you can still easily see what I'm talking about ,I converted the AVI into Xvid format (9.4 MB filesize) The first half of the video is 360 version.
Pay attention to Isac's back when he walks into the light (large bands on PS3), also look at the wall to the right and you'll see the banding I'm referring to.
Video link
here.
Does this take away from the experience? Not really.. I just like comparing technical differences in games and remember I own both consoles so I'm not bias