Xbox, my pc probably wouldn't run it anyway. My xbox on the other hand is hooked up to a good sized tv and I have a comfy couch to play from - that's important when I'm going to sink a couple of hundred hours into this game, I'd rather be away from my desk.
I'll pick it up for pc a few years down the line, I've got Morrowind and Oblivion on both xbox and pc, and I see no reason not to continue the trend. Not having immeadiate access to mods doesn't bother me as I'd rather fully explore the base game and it's inevitable dlc first. Can't wait to see what the modding community eventually produces for this though, so of the Morrowind mods are extremely impressive.