Last week I officially switched (reluctantly and with a bad taste in my mouth) from Spotify to Apple Music.
Why? Simply because when I'm driving I want to dictate by voice command what song I want to play. I could not do this with Spotify, that's why I switched.
Next time I won't get an iphone because of the bad taste this experience has left me (the worst part is apple's voice transcription technology is so bad compared to Google's... so half the time even that doesn't work)