Both, Revisor and Aust produce great razors. Revisor is a larger company though with nearly 100 year of history, Ralf Aust a one man show, making razors for 10 yars or so, maybe more individual. Both companies get their razor blankets from the same company as far as I know and both use an old hollow grinding mashine (C.F. Ern's Hexe) for grinding. I could not found main quality differences between both brands. I would add the company Wacker as choice. The above mentioned quality and production criteria also applies for Wacker. Anyhow you cannot go wrong with one of these, whatever you choose.