Slightly off topic. Funnily enough I tried Tidal yesterday on my Iphone, took the free trial to find what all the fuss was about.
Comparing to Spotify, I opened up identical tracks on both apps, making sure they were exactly the same track from the same album.
Genres varied between Jazz, Classical and Dance.
Rather than play one track on Spotify then play the same track on Tidal - (by the time you restart the track your expectation bias kicks in) I did...