Xbox 360 has a better library, a great deal more western style games (shooters), also, I have one of the original run models (the ones without the HDMI port, and it still runs well enough, albeit noisily, but then they were noisier then and time has only made it more so.
Ultimately, it really boils down to two key points; games, blu-ray. If you plan on using the PS3 for both, then that seems like a logical choice, but if it's all about games the Xbox 360 is still the better of the two... for now. Seriously, people clamor over the silliest things on both consoles, you just see it more often on the PS3 because the library is slimmer so they tend to be more starved for good titles. Though again, I stress that this seems to be changing a bit.
I, for one, would eventually like to have both. God of War 3 just looks way too good to miss.