Digital Foundry Comparison of AA:
http://www.eurogamer.net/articles/digitalfoundry-batman-demo-showdown-blog-entry
Our survey says that based on the technical performance of this demo, nobody is going to be disappointed with Batman: Arkham Asylum. Both games maintain 30FPS for the most part with minimal screen-tear, and
in our representative sample of around 17,000 frames, a mere 1.7 per cent of them were torn on PS3 compared to 0.2 per cent on 360. Due to the dark nature of the game, and the fact that it doesn't deal in fast, colourful action, even those torn frames were rarely noticeable.
If 1.7% of 17,000 frames is enough to bother you, well I don't know what to say. The differences are hardly noticeable.