Console gaming.
inb4shitstorm.
Why?
You can't sit down at a PC with three mates and play the same game on one screen. At least not on most games, since they usually only go up to 2-players-splitscreen on the PC.
My 360 was way cheaper than some uber gaming computer and I never have to upgrade again until the next console comes out, which is at least another four years away.
I don't know about others, but I don't shit enough money to buy an uber pc and then upgrade it every year.
And this once-you-go-PC is bullshit, I spent time both playing XBox and PC and I'm much more tempted to play games on the XBox.