The accuphase is pure class a and the mac is ab so in terms of overall sound quality the accuphase should be better, there is also a big price difference between pure class a and ab. The Mac 252 is a outstanding amp but its in a different league than the accuphase, as you know the accuphase that is the same wattage as the mac 252 is Accuphase M-2000 at $30,000 per pair. accupase is more comparably to lamm or chord, its kind of like saying what would you prefer a Corvette or a Ferrari.