You should use your PC. Mods, and a much greater capacity for graphics- speed and gameplay. End of Discussion
Why don't we address the question he posed rather than use it as an excuse to push your own personal agenda?
OP: It depends. Historically TES has been entirely single-player, and this installment hasn't yet hinted that it'll be any different in thay regard, so it really comes down to personal preference. As someone who owns both, take it from me: the two consoles are theoretically capable of accomplishing most of the same things. Unless Bethesda screws up development on one of the platforms, the only real differences between the two are differences you could already address now. Things like controls, online systems, etc.
So, if have a preference, go with your gut for now. Otherwise, wait to see how the game shapes up (and if there's any sort of online functionality) before finalizing your decision - it's the safest bet, really.