Why would anyone want class AB amp when class A always sounds better ?


Cost ? Heat? Reliability?
inna
I like what ARCAM did with their AVR 850 with their class G technology.  Great design.  I would imagine the big concern would be the heat factor.  AB is a good compromise.  
The lowest distortion amp in existence is class AB. The problem with this amp is it doesn’t have any low-order harmonics to help mask any inadequacies in upstream gear or the recording. 
"Why would anyone marry a brunette when blondes always have more fun?"
If you wanna be happy for the rest of your life, never make a pretty woman your wife...