for the money, has to be PS3.
PS3 has wireless built in, but mine is hard wired as the wireless is carp, 360 wireless is an expensive add on, but works way way better than my Sony/PS3 wireless and i don't have to wait an age when downloading stuff off LIVE, can't say the same about PSN.
at £27 a year, LIVE is not cheap and is rather bliddy expensive if you have family members who want to game on a user name of there own. free on PS3, no mater how many users.
both have great exclusives, but if the fankids are to be believed, PS3's look way better.
the little things...
joypads are much of muchness. but for me the 360 easily has the best pad around with no awkward/missing trigger controls and it just feels wrong having to use L1/R1 to shoot in Uncharted 2 and i keep throwing grenades because my finger touches L2 in the heat of battle. and yes, i do have those little trigger covers fitted to my PS3, but not a lot of use if the game wont let you set the controls to use them.
updates are a pain on PS3, most of my games have needed an update (and boy do they take a time to download) before playing and why do i have to click on licensing agreements before i play some games. with 360 it might say an update is available, but seconds later your good to go.
while i prefer Achievements over Trophies, they are growing on me.
upgrade your HD on PS3 at low cost, 360 on the other hand has way overpriced small size HD's in comparison.
you get to try demos of all games off Arcade before you buy, not so on PSN.