I will go with Nrchy. The more I interact with other audiophiles the more amazed I am that it is a matter of taste. I though I would never go back to tubes but, you guessed it, I got about 35 of them heating up my listening room and they're class AB.
And they sound wonderful at low volumes.
Truth is, my previous SS class AB didn't sound too bad at low volumes either. Or loud.
Theoretically, class A amps should have an advantage since there is no transition from push to pull near zero voltage as there is in a class B amp. This transition can be a source of distortion. But, for the high end amps which are usually at least Class AB, the transition is moved up to higher sound levels (i.e. it is not at zero amplitude) and the amount of distortion due to the transition is greatly reduced.
Maybe some people are more sensitive. On my amp, which runs class AB, the amount of bias is adjustable. If it is biased higher, it provides class A operation to higher amplitudes and becomes more linear. So if you are sensitive to this just change the bias with some reduction of power tube lifetime.