As you can see from the video, there's barely anything to tell these games apart. They're both equally excellent to look at, and the overall gameplay experience is virtually identical. However, proving that direct performance of UE3 isn't completely identical, there are technical differences in how Unreal Engine 3 runs. First of all, there's the question of anti-aliasing. Mirror's Edge is a game with a hell of a lot of detail and hard-edged architecture, meaning a lot of potential for the dreaded 'jaggies' to make an appearance. PlayStation 3 has nothing in the way of anti-aliasing to smooth off the image, whereas the Xbox 360 code employs AA selectively to make the game look marginally more appealing.
There's also the question of v-lock and screen-tear and the way each console handles it. For the most part, the 360 version is v-locked, but when it drops frames, it can do so quite severely - and you get a couple of frames of bonus screen-tear to boot. The PS3 version isn't v-locked, so runs a touch smoother in a few rare instances, but has noticeably more tearing. Curiously, both games have difficulties handling different scenes. In terms of real-life impact, the tearing is a minor annoyance on the PS3 (most noticeable on left-to-right panning motion - for example, the introduction scene), and the dropped frames on the 360 game are weirdly only noticeable on the cut-scenes with close-ups of other characters - Faith hugging her sister being a case in point.
weird still looks pretty though. Actually it's just really noticeable on the buildings on the left... other than that looks good.
