Anything > Halo 3
Netflix should be on the PS3 before too long, with the Xbox 360 you must be a gold member to use netfix, I wonder if the PS3 will offer it for free?
I buy all my multiplayer games for the Xbox360, however any single player games I always buy on my PS3 Im on my 5th xbox 360 so that kinda bummed me out about the 360 plus I like how the PS3 system is, I like the interface more and the conrollers. My PS3 controllers rarely ever dies. However my 360 controllers eat batteries like no other, I use rechargeables and that helps but its still annoying.
Also, having one of the best bluray players out there is also a plus.
If I could only have one, I'd go with the PS3. I do play a lot of single player games. I have a lot of friends who play COD on the PS3 and they have zero issues with the online play.
I play Street Fighter 4 on the PS3 and have had zero issues with online play. Only thing I dislike is match making/hooking up with friends is a bit more tricky then the 360. Only reason I didnt get it on the 360 is due to the shitty ass piecec of shit D pad the 360 has.