I would have to say PC, for many reasons.
1)Superior Graphics
2)Mouse+Keyboard>Controller and Analog Sticks
3)Loads more customization (RAM, Memory, Mouses, etc.)
4)Seems like PC is always a step ahead of console
-Already shifted towards downloadable games (Primary way to buy=DL)
-Faster Processors
If I think of any more I'll update
The only downside to PC in my opinion is how pricey they can be, butit can be well worth it.