No advantages.
If your lucky enough to hit a car hard enough and square enough for the airbag to go off, then you want an airbag there.
If your worried about facial disfigurement caused by an airbag going off in your face, I don't think it will do quite as much damage as you face planting into your steering wheel. Plus it has the added advantage of partially shielding racoons, dirty reeboks and other unpleasantries from hitting u in the face.