PS3 has fail internet(gameplay), I guess cause it's free there are no mods that ban people from using modded controllers and other cheats. Wth is that Sony? Rather than Xbox bans you the next day or so.
Obviously the 360. I never actually enjoyed using a PS3.
For a few reasons, but mainly due to the controller;
The L and R triggers are too far back.
The controller is too small.
The charger lead, that measures about two centimetres.
Ten hour updates and installs at the beggining of every game you play.
DLC's arriving two to three months late.
Etc...