My take is different, there is good sound and bad sound. 20 to 30 years ago solid state amps were appalling, and the only solution was to go tube, which is what I did. Nowadays solid state amps are "ube" good, and so I have given up the tube thing.
I would say don't get hung up on the technology, listen and whether it is class A, A/B, D, and the rest of the alphabet, or tube go for the best sound.
The fundamental difference is something to do with distortion and clipping, tubes do it in a nicer way than transistors (even order harmonics). There is a hassle value with tubes, warming up, current draw and heat...and the tubes are constantly wearing out! What always amazes me is people buy exorbitantly priced tube gear, and the first thing they do is roll the tubes:)...like the designer got it wrong>
OK OK I also rolled tubes, it was fun:)
Bottom line is there are good and bad implementations of both SS and tube amps, so one is not necessarily better than the other. Historically there was a time when tubes in general knocked the socks off solid state.