Both platforms (pc and xbox) have good things in it ...
I think it's a personal opinnion which platform you choose
I prefer for sure the xbox (modding I don't know anything about it and graphics are almost even beautiful, certainly if you have a good quality TV or flatxcreen to play on xbox.
I met only one kind of a bug (already report on this forum), that's all for the moment AND it's easy to solve too!