Lossless audio and a unique and useful dedicated iPhone app for Classical Music (where, among other features, you can access the booklets of the albums, like on Qobuz).
Easy to use on iPhone, MacBook and HomePods.
Tidal and Spotify are certainly great too. But the advantages of Apple Music listed above just work for me.
And Iโm a fairly heavy listener (mainly Classical Music, Jazz, Fado): for example my total listening time is 77110 minutes in 2015 and 79959 minutes in 2014.
Best, Emmanuel