PC gaming has and always will be better. The sooner people figure that out, the sooner you won't have to worry about your friends being dumb and playing on Xbox instead of PC.
You can build a PC capable of running Skyrim on Ultra with no lag for less than 500 dollars. An Xbox costs 200-300 dollars to buy new + 60 dollars for BO2 + 60 dollars for 1 year of membership.
You're at around 400 dollars already!
PC = 500 dollars + 60 dollars for the game = around 560-700 dollars.
Now consider that this is BO2 and not Skyrim we are talking about, you can take some components away from the computer and make it even cheaper and upgrade over time!!
So in the long run, PC saves you money and has better gaming, and way more capabilities than Xbox and PS3 combined. PC all the way.