We found a public document of Owens Corning, which contains a comparison between PUR foam and mineral wool. I guess that this kind of comparisons are not allowed in Europe and that is a pity. We can expect that the document will not be negative about mineral wool like the following citation shows:
Compare Thermafiber Mineral Wool to Spray Foam Insulation (Closed Cell). Compare the efficiency. Compare fire protection. Compare aesthetics. Compare prices, too. Whatever your criteria, the more you compare, the more benefits you’ll find with Thermafiber.
Non-combustibility, fire resistance and condensation possibilities are the main advantages of mineral wool. The same arguments could be used for cellular glass.
A lot problems with PUR, PIR, EPS, XPS, …. can be solved by combining them in a sandwich with cellular glass. GLAPOR cellular glass is working together with large manufacturers in that perspective.