I would like to say after reading so many hard, down right fanboy post that this guy has probably gone from this thread along time ago. If he happens to come back let me give you a few pointers that may or may not give you what you are looking for.
xbox 360 Playstation 3
Halo franchise fps Killzone franchise fps
Gears of war Tps Unreal tournament (most supported version) fps
Left 4 dead fps Resistance franchise
fable franchise White Knight chronicles (import from Japan)
too human Uncharted franchise tps
star ocean 4 Folksoul
blue dragon Disgaea
Halo wars rts valkyrie chronicles srpg
These games largely make up some of the most high profile games for both consoles imob. They share a ton of games such as eternal sonata, tales of vesperia (just announced), all sports games from ea and the 2k series. Also they both have GTA4, Devil may cry 4, far cry, bioshock, oblivion, fallout3, and ninja gaiden 2 (annouced as sigma 2). So it is all opinion whether one console is better than the other. On the technical side there are some differences to consider as well.
Playstation 3 xbox 360
built in wifi not included, add on 100$ wifi adaptor
built in blue tooth properietary wireless accesories
blu-ray,dvd,psn videostore netflicks, dvd, defunct HDdvd add on
Multimedia functionality multimedia functionality
web browser no web browser
contained in controller batteries are needed for controller
7.1,LPcm, no loss 5.1 lossey audio
more native 1080p games 2 1080p native games
psn free multiplayer xbox live has 39.99 a year fee
