The two things i will give TW2 over Skyrim is graphics and its system of perks. The graphics were great, but it was a very confined gameworld you were rolling around in at any one time. So they could afford to be, i'm actually pretty interested in seeing how the console port of TW2 looks because if it doesn't have its graphics then it doesn't have much going for it other than the nvdes in that crowd. As far as the perks go; i liked the mutagen system but found it not very fleshed out. At least not to point i would have preferred. Ultimately they were an after thought even on the hard(est) difficulty. It was a novel concept though but would probably be hard to adapt to some other franchise. But on that same token you were obviously much more free to choose how you played in skyrim.
Ultimately they are two extremely different games i personally only played through TW2 twice, once for each "side" as it were and never looked back. I've already surpassed the elapsed time i spent in TW2 3 times, mods will ultimately make a mockery of any other game in terms of play time and ultimate value. This alone makes skyrim the defacto champion for a mere 60 dollars.