I had mccormack dna 0.5 rev b then Rev A from steve himself for a number years and just recently acquired a 3bst and 3bsst.
The mccormack and bryston are two different amps. They both have strengths and weaknesses just like all other things.
Mccormack is very good at the highs and mids. Its tube like, sweet, detailed and very musical. However the bass is not quite as potent as the 3bsst or the 3bst. It can be soft sounding. More laidback.
The Brystons have very clean sound, bass is very powerful. Can drive more difficult speakers than the Mccormack. However its not as tubey or as sweet as the Mccormack. The sound is more frontal than the Mccormack. In a way, the Brystons sounds a little dry compared to the "wetter" sound , tube like of the Mccormack.
Different speakers react to different amps, therefore I have both because some speakers like the Brystons more, while others prefer the McCormack.