I need to update my experience with Amazon Music.

It was essential for me, in order to get the best sound, to manually adjust the sample rate on my control panel in windows streaming Amazon Music through a laptop and Audioquest Red Dragonfly.  
The sound quality went from really bad (worse than mp3) to really good.

I’ll have to listen some more and check out the music selection a bit more but Amazon Music jumped from last place to a possible first place for me.

Exciting stuff!
I’ve had the Ultra HD option for a few weeks now. Significant upgrade to my Tidal subscription. I think Tidal has an easier interface, but aurally Amazon seems better. The "Abbey Road" 50th release is expansive and enveloping through both; but Amazon has so many more layers.

Amazon Ultra HD files of Janelle Monae's "Dirty Computer" reveal what a complex production that album is; the same can be said for the Heifetz rendition of Tchaikovsky's "Violin Concerto in D Major" - though none could hold a candle to my vinyl first pressing of the same.
Don't get too excited about "Ultra HD" files on Amazon.  Those files are merely standard resolution CD quality recordings re-processed into a 24bit container.  You cannot add quality to an original analog (or digital 16bit) recording merely by encasing it in a higher bit rate package.  That Amazon is involved in this deception is very disappointing.
Okay. So I assume my perception that they have more body and depth than Tidal is erroneous?