I had a very strange experience when comparing Qobuz to Tidal a couple of years ago, when I was trying to decide which service had the best sound quality. I pulled up "Jack of Speed" from Steely Dan's "Two Against Nature" album.
There is a prominent trombone phrase throughout the song which sits fairly upfront in the mix on the original CD and on Tidal. When hearing it on Qobuz, it sat much lower in the mix. It was as if someone did a re-mix (not just a re-master), and really lowered that individual track. I don't think it had been re-released at that time, so it left me scratching my head and thinking WTF. That made my mind up to go with Tidal.