The PC version at 1080p looks damn amazing, makes the 360 look old and washed out; don't forget the PC has colour enhancing features on the Graphics Card controller, so you can get much deeper and richer colours on the PC version too.
Have you heard of TF2 on Xbox 360? MS didn't allow Valve to release the DLC for free on 360. MS has the idea of 'if the developers wont charge for it, we will $_$'. In the end Valve refused...
So be cautious about what platform you buy it for...