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1 little wire versus ghetto looking seems like a no brainer decision in my opinion.
But what you want needs another input for control. So if you do it off of a relay or a microcontroller, you need 1 more input telling it when to turn on. 1 input means 1 wire. So no matter what you do, you will have at a minimum 1 more wire to run.
And guessing from your username, you have a mustang. Well if I can fit all my cables (shielded VGA and USB, 2 sets of 4awg wire, 4 sets of 8awg wire, and 8 speaker wires) into a single plastic channel down the side of the car, I can pretty much guarentee you have space for a single 10awg or so wire to where your psu is.
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