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

Seems to me that whichever one is designed the best will sound better, be it A, A/B, or D - those letters do not specify qualitylll 

Class A sound better?  No, lots of factors to consider.  You have first of all assumed Class A sounds better.  Not always true.

Class A sound better? No, lots of factors to consider. You have first of all assumed Class A sounds better. Not always true.

Exactly.  I own four Class A amps so obviously like what they offer (aside from the heat and the electric bill), but horses for courses - some Class AB amps sound better in some systems. Generalizations like the original posts are meant to stir fuss, not logical response.

I use a Class AB tube amp in my main system as a matter of fact, and I prefer it with those speakers to the 100 lb. + Class A monos I used to use. OTOH I use a stereo Class A amp with some electrostatics and it is a great match.  YMMV

Gato Audio, a Swedish company makes AB amps that will compete with almost any class A amp. They now sell factory direct with free shipping. And best of all no sales tax. Steve Guttenberg did a review  recently.