Overall I'd say PC. You can do a lot more with a PC and most of the features of the new consoles are things that have been on the PC for years and are just common place. Game wise the PC is a much more open market, games are cheaper and of much greater variety, not to mention all the emulation available to play console/arcade classics, aswell as some current games (DS), even if it isn't legal.
On top of that a current modern PC though more expensive is also much more powerful than any of the next generation consoles, and the graphical experience these new consoles will bring has already been with us on the PC's for years (for the most part). So yeah a PC does cost a lot more money (atleast at this point when you compare to PS4), but it offers a lot more too.
Save for a few select franchises that are exclusive to the consoles the PC gives you everything and more.