You are really talking about 2 completely different animals here. A vintage tube amp vs a relatively new SS amp are two very different things and you shouldn't expect them to compare the same. It will also be very dependent on your other source equipment and especially your speakers. You will not get the bass control with the Mac that you currently would get from the Classe and the highs will sound more rolled off. On the other hand the Classe will not have the midrange "magic" of a vintage amp. I've owned a Classe CA 200 and now have a Mac 2012 tube amp. This might be a closer comparison, but even though they are both new designs, a person really needs to hear both to decide which they would like better.
