If your buying through a building merchant they might have a primary relationship with a particular supplier. We have done a loft conversion and a self build using quinn therm. Although i'm not sure on shrinkage as it's all covered up with plasterboard.   Really not much to choose between brands.   The main point is to make sure you invest in proper protective items (good mask, googles, henry hoover etc). Last thing you want is to breeze in a load of dust when coronavirus is