Sign Foam and Precision Board are the only two HDUs readily available to me. I want to use at least the 18lb Sign Foam. For $62 more on a 4x8 sheet, I can step up to 30lb Precision Board.

I am sure these companies rate their densities a little different, but I am thinking the 30lb would be worth an extra $62 ~ roughly 20% increase. I have used Sign Foam, but not Precision Board.

Does anyone disagree that the 30lb Precision Board is the way to go over 18lb Sign Foam?