360 - Don't have to upgrade your rig, mics are better, the feeling of a console, splitscreen.
PC - Modding, Maps, Console
I don't agree with those.
Mics are stuffty on xbox. Horrible quality. Normal headsets are superior to the flimsy 360 headset.
Feeling of a console, is a good or bad depending which you like better. Can't we just say on PC "Feeling of a PC" ?
Split-Screen, yes because I want to have less of a screen and be cramped with my friends. Also you can do it on PC too.
EDIT: I thought of a Pro for PC and Con for 360.
360 - You have to play a monthly subscription to live if you want to play with your friends.
PC - You don't have to.