The Xbox 360 version is softer and noticeably fuzzier than the PS3 release: while both versions utilise a form of FXAA that attempts to mimic traditional multi-sampling style coverage across edges (but considerably blurring the image in the process), the PS3 version renders natively at 720p whereas a sub-HD resolution is in place on the Microsoft console. Pixel counting puts the ballpark native resolution on the 360 at around 1200x688.
Beyond the framebuffer set-up, we find the core art and most of the effects work is interchangeable between PS3 and 360, although there are some unexpected differences between the two platforms that were not present in Black Flag. For one, SSAO is present on PS3, helping to add depth to characters and the environment, while on Xbox 360 the effect is completely absent, lending more brightly lit scenes a generally flatter appearance. Secondly, in most cases we find that streaming is generally slower on 360, with low resolution textures left on-screen (sometimes without normal maps) for a few seconds during changes in camera angles in some cut-scenes, and when transitioning to gameplay. The situation is much improved on PS3, where the majority of the best quality assets are usually loaded in before the scene begins.