GaN FET Amps vs. Traditional Class D Amps

I own a 2K Peachtree GAN FET amp and an Aavik Pascal Module Class D amp ( the most expensive Class D Module to date @ 20K. The Aavik sounds in a different league ,HOWEVER...the Peachtree with a quality tube preamp is a delightfully musical experience. I have the Aavik to match the wonderfull highly regarded Borresen X-3 speakers......but the Peachtree drives them beautifully also and very musical I might add !

@agisthos - So at that time, Putzy's NC1200 Hypex amps were being hyped in the reviews as "better than Class A" with many adaptors happy to finally have an option for good sound with the conveniences of low heat and small size.  At first, they seemed to sound good with rich tonal qualities through the midrange and tight, powerful bass but, over time, I noticed things that just didn't sound as realistic as with the Class A and AB amplifiers I had owned.  This review (link) describes pretty much what I heard, and specifically:

"All notes were there but the illusion of musicians standing in front of me wasn`t convincing at all. The music didn`t sound inviting and involving, it was just… there.
The emotional content was missing and the tonal colours were somewhat bleached. For lovers of analog reproduction and concert goers the sound could also be quite fatiguing and plain boring."

As to my amplifiers, I had previously owned a pair of Clayton Audio M300 (Class A) monos, which I sold after purchasing the Acoustic Imagery Atsah NC1200 Class D mono amps.  When I sold those Class D amps, I purchased another pair of Clayton M300s.  Shortly after, I purchased a pair of Lamm M1.2 Reference amps, which also sounded very good but sort of ran out of steam with my low'ish efficiency Aerial speakers and so I ultimately ended up working with SMc Audio to build me a pair of high-powered monoblocks constructed from two DNA-1 amplifiers.  The two DNA-1s were totally rebuilt using SMc Audio's new boards, low-noise Plitron transformers, Gravity Base, and everything they could do in 2020.  The SMc Amps sound great and I have no desire to make any other changes.

Having heard several current Class D designs, gan-fet included. They sound fine, but I hear the lack of overtones, decay, body, and depth. They sound good though, I would not bash them, they are very clean and quiet and fast, 1st transients are their strong points, sound comes at you with impact. To me, it gets into what you enjoy, but if, over the many years, you have gained experience and an ear for real sound reproduction, class D would take some getting used to. I do love their lack of weight, so that is tempting for me, any amp over 75 lbs. I am no longer interested in it at my age. 

https://forum.audiogon.com/posts/2795609

Can someone describe how the sound of the Aavik is better? 

Need to listen to the Atma-sphere amps. To date, the best I have heard are the false tube type made in Italy. Cant remember the company name. Still not as good as tradition types to my ears. Most class D I have heard sound pretty pedestrian.