Lots of games for 2009 and 2010 to look forward to on both PS3 and 360. Forza is the best racing series on the 360 which is head and shoulders above anything else on the 360. However Gran Turismo series trumps Forza series due to its long established loyal fan base which is over 12 years old: worldwide popualrity of Play station helps push the Gran turismo series sales significantly. Forza series has been only going around for 5 years and is doing well, but still a distant second behind Gran turismo series.
I have no idea why Gears of War 3 and God of War 3 were paired off: Third Person Shooter against a Hack n' Slash is stupid, despite the games sharing similar sounding names.
2009 and 2010 should be intereting in regards to exclusive games sales on both PS3 and 360. The multi-platform games for 2009 includes: Assassins Creed 2, Modern Warfare 2 and many other titles that will sell well on both PS3 and 360.
Top 3 exclusives on PS3 for remainder of 2009 to watch are Uncharted 2, Ratchet and Clank: A Crack In Time and MAG. 360 exclusives includes: Halo 3:ODST, Forza 3 and Splinter Cell: Conviction. Left 4 Dead 2 on 360 will be on PC so is technically not a true exclusive. Excluding DLC which I do not count as game releases, they are just add-ons.