I have written about badger grades in my shaving brush blog here:
There is some agreement on pure, best and silvertip being in ascending order of softness. But no consistency in other words like "super" or "finest". Rooney go from pure to best, silvertip,super and finest. Vulfix go pure, super and silvertip. Simpsons have pure, best and super. Edwin Jagger go pure, best, super then silvertip. And there are other variations.
For the time being, my New Forest brushes will just be two grades: Superior badger - a two band which is firm with soft white tips - and Finest silvertip. A high quality redressed silvertip.