I'm going to wait for Skyrim before I decide this. But definitely getting them both.
Skyrim will be fun for its open world sandbox, but im not even considering the game at all when it comes to looking for a good story, and well written dialogue and characters.
I mean look at fallout 3 and oblivion. Do those games have a decent plot, not really, well written dialogue, nope, and do any of the people you meet have life to them, thoughts, something more than the shallow i am suppose to be this guy routine, nope.
skyrim will be fun for sure, but game of the year needs to provide something beyond a sandbox.