Ì have only 2 brushes. One Simpson Grosvenor, mixed bristle and badger, the other a Mùhle synthetic travel brush.. The Simpson is great, easily making wonderful lather. I decided to use the Mùhle synthetic and was shocked at the difference! Poor lather, little cushion etc, resulting in a poor shave. Same soap and razor. The synthetic works great with cream, but hopeless with soap, in This case the wonderful SV.