Microsoft demos the PS3 and 360 together.

ms shows off ps3 and 360 side by side.
http://www.mtv.com/news/articles/1548407/20061218/index.jhtml

i think the fact that multiconsole game seem a bit better on the 360 like madden because the dev kits for the 360 have been out a year longer, and the series already has been tuned to the 360. a port of a game from one system to another is never truly identical because it was optimized for the original system. games like madden (the snow case) are a great showcase for this, because madden 06 and 07 are the same game with some improvements and refinement, and its had due time on the 360 to be efficient. theres alot of info in there.