The short answer is that there are more unique and fun games for the 360 than the PS3. While the PS3 has more powerful hardware and a Blue ray player built in, the exclusive content is marginal at best. The exception is Metal Gear, however I stopped praying at the alter of Hideo Kojima after Sons of Liberty because the series is way to preaching and with WAY too many long winded monologue sequences for it to be called a game instead of an Interactive movie.
Of the exclusive titles, Mass Effect, Gears of War, Rock Band, Halo 3, Ace Combat 6, and the upcoming Fable 2 justify the 360, imho.
Of the titles shared between the two; CoD4, GTAIV, Assassin's Creed, Oblivion, Soul Calibur 4 and DMC I don't notice much of a difference between them, but it's all subjective, yes?
