I've always used the 1" Dow Blue product. Dow once marketed the product as a Styrofoam insulation product. I'll be ready for a new batch soon to put against the wall on the long side of the '25 table length that's rest flush against the wall to create a removable base for the scenery backdrop. I like the density of the Blue, and the ease of making smooth cuts with a retired electric kitchen knife...easy to shape the product as needed.
I'm sure the OC Pink product is readily comparable. I'm not familiar with the green...although it probably boils down to your color preference and cost
