I'd say PS3
because of a lot of potentially great exclusives in the future (gran turismo 5, FF versus XIII, Resistance 2, the agency, God of war 3, White Knight Chronicles, Uncharted 2, etc)
and the awesome exclusives now (uncharted, killzone 2, mgs4, ratchet & clank, Little big Planet, Infamous, Wipeout, Demon's Souls, etc)
It's also getting some good Jrpg's coming now and in the future if your into those
then there's also the free online gaming, good reliability, wifi and the blu-ray playing capability