Choosing a shaving brush can be as challenging as choosing a safety razor. The large selection of brushes, array of hair sources (badger, boar or horse), range of grades of hair (pure, best, super and silver-tip in the case of badger hair), choice of shapes or materials for handles, and variety of knot sizes seem to produce a certain “buyers’ block”. Some simple rules to follow: Bigger is not always better. Some big brushes, while certainly looking the part, might…