In 2008, PS3 really shined with the best exclusives of the year: LittleBigPlanet, Metal Gear Solid 4, Motorstorm Pacific Rift, Wipeout, etc.
In 2009, PS3 was on top by a wide margin. There really wasn't even any competition. It had the mainstream game of the year with Uncharted 2, arguably the best RPG of the generation with Demon's Souls, the best open world game with Infamous, and Killzone 2, Ratchet & Clank, and of course that's just the exclusives. And it got an extremely competitive price drop, Netflix support, and day and date releases on all big multiplatform titles.