If you want more of a euphonic tube sound go with Mac.Well made classic design.BAT if you have need for more current as it's 150 versus 150 wpc) and more of a neutral sound.I sold the Mac and it's a great [piece with tubes that are not cheapest to replace (more than 6650 or mid range champ EL34) tha gives a biut more dynamic slam than other tubes.have read recently from knowlegeable source that in his mind the greater bass with 6550's buit i was always under impression that KT88 delivered more in bass region.Other than super tube forgeting tube compliment in the more expensive BAT (buy used and i equals out a bit) and BAT has relacement super tubes (not just one pair) as does Muisc Fidelity with their esoteric tubes.I'd base it on speaker,room size,and music preferences (more power for larger ensemble and Mac for small group classical and jazz.You also have other option like Muisc Fideltity,VAC and other because this is in higher range of Integrated prices
Hope these few tid bits but by no means complete coparrison helps a bit.
G'luck
Chazz
Hope these few tid bits but by no means complete coparrison helps a bit.
G'luck
Chazz