I used the "white" 3/4" insulation. It runs truer to width than the "pink" or "blue" and also compresses easier. This is important when you're trying to fit 3/4" material into the actual 23/32" width of 3/4" plywood walls. The white type is more messy, though.
As an aside, most glues will not readily bond to the plastic vapor barrier, so I peeled it off both sides before gluing. Also, the foil radiant barrier is usually between the insulation foam and the vapor barrier and unfortunately it comes off when you peel off the plastic.