03-16-2010, 02:26 PM
Based on the info you mention, I'd definitely lean toward the poly. In this case, bigger is better for those driving by. Of less concern is durability, since they'll be there only for a limited time. And the fact that they're a little less expensive is an added bonus.
Al that said, I have no direct experience with either.
Al that said, I have no direct experience with either.