I was thinking about this this morning (before work), if left uncovered because I do all highway driving on some of the worst roads (Pittsburgh) my hood will chip and then rust because of the chips to the paint and the fact that they are uncovered.
Or I can get a bra but then will have to ge the hood repainted after a few years due to the scratches.
But scratches wont rust where as chiups will, Make you wonder the lesser of the two evils.