I've owned 2 of both and here's how I see it.
Ps3 good- free psn, blu Ray, quiet, psu built in, free wifi, free charging cable included bigger hard drive size and ability to change out for a bigger faster hard drive, uncharted series and little big planet are awesome games.
ps3 bad- psn sucks, update and psn downloads take forever, wifi is slow unless
you set it up thru a pc, some had faulty wifi and faulty drives that equals expensive repair, console is fugly, controller just feels unnatural, load times
seem slow
360 good- live is awesome works very good and you get alot less lag, controller feels great, console looks good, messaging is great, huge game library, better chance at getting used games cheaper, it's alot more reliable now then before, better warranty 3yrs vs 1 with Sony, new consoles are quiet, updates are speedy fast, alot of people online at one time
360 bad- old ones are loud, old ones break down alot, no free charging cable including, live isn't free but it's the best, no free wifi, no music or movie dl's as it has no browser, halo 3 sucks big cahonas, exclusives suck, seems to be getting alot of hackers now.
I honestly think if you have a pc then there is no need to get a ps3 at all unless you want uncharted, lbp, gow or the free wifi. I've owned 2 of both early on, both 360's broke down and I had a drive go out in one ps3, I then had a wifi unit go out in the other.
They are both good consoles depending on what you need and want to play. I sold my ps3 and built rig in sig with the money left over because I wanted to have the option of mods in certain games. I'm buying another console January 11th the day after my bday and it's gonna be a new 360.