@ ZenfoldorVGI
Multi-platform games design has its disadvantages, developers usually want to re-use as many assets as possible resulting into sacrifices (game engine, design and assets). Some Amiga exclusives would have been severely sacrificed (or would have ended up as a very different game) if they would have been co-developed for the Atari ST. Like GTA IV would have come with more content if both consoles had Blu-Ray or the upcoming Ghostbusters would have had more things going on on screen at once if both consoles had the Cell processor.
The 360 is an easier platform to develop for, using easier but far less efficient coding practices (especially with the PS3 architecture). Luckily Tekken 6 should be different though as the game's development was lead on the PS3, which should result into excellent efficient code suited to be ported to 360 as well as towards PCs.