Definitely PC (even if I did own a console, which would be useless anyway, since I wouldn't buy games for it).
For example, Two Worlds 2 costs about 30? on PC, 50? on XBox and 60? on PS3. That's the standard edition, no fancy bonus items or collectibles.
Of course, the cost of a console game is somewhat balanced out by the fact that the consoles are usually cheaper than an equally powerful PC system, but only until you bought so many games that you made up for the difference.
And I can do other things with my PC, like work, surf the internet and pretyy much everything that can be done digitally.
If I want to get the console feeling, I can still connect my PC to an HD TV and plug in an XBox (or PS3) gamepad.