From the PlanetPlaystation.com feature list:
"This is one of those topics that will be debated til the end of time, is the Xbox 360 or Playstation 3 better and which has the better video game lineup. Well both have third-party games a plenty, and that's counting the huge sellers like Modern Warfare 3, Madden Football, Skyrim, Dead Space, and so on. What really gets people going is which system has the better exclusives, and that's what I'm going to look at today in our feature article: The Top 10 Best Playstation 3 Exclusives. Obviously this is just one person's opinion and it doesn't count what hasn't been released yet but for now just make sure you have at least played each and every game on this list, because they are all fantastic reasons to own a PS3."
My PS3 ones are
Yakuza 3 or 4 like them just the same
Resistance 3
Infamous 2
GT5
Killzone 2 or 3 like them just the same
Motorstorm Pacific Rift
Starhawk
Uncharted 3
Wipeout
Demon's Souls
It's hard just to choose 10, this list may change.
Halo ODST
Halo Reach
Halo Wars
Halo Anniversary
Forza 2
Forza 3
Forza 4
Fable 2
Fable 3
Sarcasm by the way if anyone misses it
Halo
Gears Of War
Forza
Fable
I'll give them Lost Oddyssey which is one of the best games I've played on the 360.
Other than those they're pretty dry.
God of War 3
Heavy Rain
Ratchet and Clank
Twisted Metal
Journey
LittleBigPlanet 2
Metal Gear Solid 4
Heavenly Sword
Valkyria Chronicles
Folklore
Make it top 20 then its not so hard to choose
@UltimaEnder I'm sure you can do a top 20 for the 360 too look forward to seeing your list.
10. Little Big Planet 2
9. Ratchet and Clank A Crack in Time
8. inFAMOUS 2
7. Resistance 3
6. Motorstorm Apocalypse
5. Starhawk
4. Uncharted 2: Among Thieves
3. Folklore
2. Metal Gear Solid 4: Guns of the Patriots
1. God of War 3
edit also journey and flower in there somewhere
Killzone 2 Multiplayer
God of War 2
LBP 1 and 2
MGS4
R & C: Future Crack in Time
Yakuza 3