I mean is that even a question???
Don't get me wrong, Xbox is better choice for many-many games, but TES? Unmodded game lasts only 10% of what a modded game could last. With mods you get: better gameplay, better graphics, more items/weapons, more quests (many of which put the original quests to shame and some of them are even voiced), new towns, dungeons, companions etc, etc.
PC all the way.
Gameplay is better on PC than console, why? I thought it depends on how much work BGS put into the console versions. IMO buy it for your 360 unless your willing to pay £1000 to upgrade your PC (If needed), if your PC is good then obviously get Skyrim for PC.
Please, I don't know WHERE do you people get the idea that a powerful pc costs £1000? Where I live, I can get a high-end laptop for less than £500