They have completely different tubes. The Masseto is heavier and has been described as a Monbrisson on steroids. The masseto has a little better low level resolution and maybe a little more dynamic sounding. They are both outstanding preamps and could both be the cornerstone of a state of the art system. It comes down to which can you afford. I have an auriges and love it and could afford it. Mr. Shindo does not believe any of his preamps are better than another, just a different flavor to the sound. Hope this helps
