I'd bite the bullet and go to structural (double OSB) panels, have seen way too many problems with nailbase and "curtainwall" (w/ drywall on one face). You only got one chance to make the roof stiff, not a place to skimp to save a grand - the nailbase gives you negligible (read NO) stiffness help. If strength is not important to you - use the nailbase. Any overhangs will require the DOSB. More chances to roll and flip scraps if you have all DOSB chunks (less waste, maybe).
I gave up on all the fancy "options" the panel folks like to push. DOSB everywhere for me.
In the field, you want the EPS foam - much easier to deal with. If shop cut, consider urethane. I find the urethane panels more inconsistent - thickness, can be challenging (especially 6").
Lots of opinions about using panels....