It's a difficult question. I mean, both consoles have great 1st party games. Here are my favourites:
PS3: The Last Guardian, Uncharted 2, LittleBigPlannet 2.
XBOX360: Fable II & III
Apart from that, there iare also quite good 3rd parties exclusive that I like:
PS3: Heavy Rain, Metal Gear Solid 4, Final Fantasy vs XIII
XBOX360: Alan Wake, Lost Oddyssey, Gears of Wars 1 & 2
May I buy an HD console or should I wait until next generation now that rumours about new homeconsoles machines are starting to flood the net?
Or should I start ignoring videogames and just dedicate to read high quality books in my spare time?