I would play both. Ever since Morrowind, Ive played both games, including Fallout 3 on PC and console. Console for relaxing on the couch and PC for mods.
Agreed. If I can cheat and spoil the game than I'm inclined to do it, and as a result I would ruin my own experience. I already have a hard time ignoring fasttravel even though I know I end up regretting using it.
So for that reason it is (imo) best to start out with a console version. You won't get tempted to download mods that add weapons that unbalance the game, or tweaks to the current balance that end up not being better as they didn't go through enough playtesting.
So I first enjoy the vanilla game on X360 and afterwards (when a high-end PC that can play Skryim becomes affordable and I'm also in the need for a new PC) I get the PC version. Than I can just look up a list of 'must-have' mods that have been playtested by thousands of fans for thousands of hours and be sure that they don't ruin the game but enhance it.
Basically it allows me to play A TES game for 200+ hours... twice.