Class A or Class D solid-state amplifiers (modern designs)

 I think most AB amps operate in class A mode up to roughly 1/10th of their full power output.  Which is to say 10dB less than peak output. So for most listening you hear only class A, and save money on your power bill.

Class A is like a muscle car. There are many that are absolutely beautiful, perform really well and others that are just gas guzzlers.

Class D is like an electric car. The same applies as Class A except the gas guzzler aspect, so that is replaced by the utilitarian electric car that under performs and has no mileage range.

That analogy doesn't hold water, if you see what I did there.

This is a troll question and insult to any audiophile. How can you be an audiophile and not already know which design is superior? Everyone knows Class A is pure euphoria. Stop this noise about Class D. But in the end you make a choice and pay your money. Mine is on Class A and tube amps. That’s all the audio anyone needs. Period. Spare me of your newfangled crap D. 

It is not about Class A or D. It is about sound quality.

If you want to hear a very good Class D amp, check out the TAD M2500; 95 lbs and sounds truly amazing. I have it and the matching preamp and E1 speakers. My end game core system.