Between all the various threads on power amp class and all the differences of opinion, I have read a lot of descriptive words that really tell me nothing about what people are hearing. In my experience there are so many variables that dictate how a head sounds. Instrument and cab pairing, eq settings, desired amount of drive heard.
So what does everyone use? More importantly to me, why do you use it? What contributes to the sound you hear and love from your amp?
First, there is a LOT of yin yang involved in the entire instrument signal chain, including bass, effects, preamp, amp, and cab.
That said, I tend to favor active Jazz-ish instruments (meaning two pickups) and either the Sadowsky or Pope preamps.
My cabs are Bergantino AE212's (2) and an HD112. As other posts have referenced, I initially got on to the AE212 from @KJung 's posts; and have stayed with them, because I like their combination of sound, storage footprint, and schleppability.
I use three different amps. My go to for live backline use is a Demeter VTBP-201 - the older 1.5 rack space version. I have one of those with the Minnie 800D internally installed. That amp in a 3 space rack bag with a Furman PLTuner, weighing in around 20 pounds total, is my fav. It's Class D; but, the Class is irrelevant to the tone. I also have a second VTBP-201 that gets used with a Crest ProLite 3.0 for higher volume work. The Demeter preamp has a 3D character that perfectly matches the various Fender sounds I use; kind of the same way an SVT does.
I also have a Bergantino B|Amp, which gets pretty close to the Demeter for tone, and does fit into that light weight Class D zone. I like the B|Amp a little better with my Alembic Series I.
Finally, I have a Shuttle 9.0; which once upon a time replaced my Trace Elliot Hexavalve. LOL. On a Bergantino NV610, no less. I use the Shuttle 9 for daily practice. On off on off on off, you get the idea. Takes a licking and keeps on ticking.
All of those are Class D. Weight is a factor, but NOT the main consideration. That's just what we are using now.