PS3 - The Last Guardian, Heavy Rain, Valkyria Chronicles, Uncharted 1/2, LBP, GT5, White Knight Chronicles, MGS4, Ratchet & Clank.
360 - Kameo, Fable 2/3, Lost Odyssey, Star Ocean: The Last Hope, Dead Rising
(this list is shorter as the 360 has some great games I bought/will buy for PC instead, such as Mass Effect 1/2).
So, according to available and upcoming exclusives I'm interested in => PS3 - and it has BluRay too.