everyone i know has a 360 and nobody i know has a ps3. the point of a console FOR ME is online/social play, otherwise i would just use my computer for gaming. because of this, if i didn't already own a 360, that would be the console i would buy.
that having been said, there are a few ps3 exclusive titles i want to play but cant (uncharted, killzone, wipeout, final fantasy, god of war).
OTOH, those games + bluray still isn't enough to get me to buy a ps3. if i had money to burn, then no doubt i would have both.