I just received an old gillette adjustable razor and am looking at brushes. Was thinking about ordering one of two Edwin Jagger brushes from Best Grooming and Shaving. The first is the P36 Pure Badger - 21mm knot. The other I'm considering is the Best Badger Ebony Urn Shaving Brush in the 19mm knot. Better to go with the Best Badger brush in the smaller size or the Pure Badger in the larger size?