PS3 is better IMO.
1) it has a variety of good exclusive in every genre.
baseball- MLB The show
sim racing- GT5
off road racing- Motorstorm
platformer- Rachet and clank, Little Big Planet
fps- killzone, resistance, mag etc
srpg- valkryia chronicles
rpg- demon's souls
3rd person shooter - Uncharted
etc
2) it doesn't have propriety accessories. ie. you can use any bluetooth headset/mouse/keyboard, or usb headset/mouse/keybard. and also use any laptop harddrive and external harddrive.
3) free online, with little to no lag.
4) most 3rd party "exclusive" on 360 comes to PS3 with more stuff. ie. Tales of Versperia, Lost Planet, Bioshock etc
5) comes with wifi, rechargable controllers etc
6) Sony has the biggest 1st/2nd party, even larger than Microsoft and Nintendo combined
7) the hardware is quite reliable
8) blu-ray
9) it has optical out (i use this to connect to my z-5500 speakers)
10) has a lot of the games I like
bonus ) it's only 299$ now and "IT ONLY DOES EVERYTHING" xP
Edit:
except for Japan
and FFvs13 is still exclusive to PS3
Edit:
I always hear great things about Xbox but nearly nothing about the Playstation... That has to mean something.
maybe because you only browse in the 360 pro. forums?
Edit:
did i mention The Last Guardian ...? *drolls*