I have not heard that combo, but all things being equal, my experience has been that most people prefer the sound of a zero-feedback amp like the Ayre. The Bryston is an honest product that features very good build quality for the money, but it sounds closed-in and two-dimensional compared to typical zero feedback designs.
PS - I owned a 4B-ST for five years.
PS - I owned a 4B-ST for five years.