I'm the same, in that I had been with iTunes since as far back as I can remember... maybe just after Winamp?staying with Apple Music as I go WAYYYYY back from iTunes, and I guess that is what makes my music suggestions so perfect. FWIW I also use Spotify, but mostly for podcasts and sharing music with my youngest who prefers Spotify.
There are apps to migrate your library from one to the other, by the way, in case you'd like to give it a try to see what it would recommend when it knows everything you like (as opposed to just the few bands you click on at sign-up).
I'm not getting paid by Spotify though, I promise, lol... If you're happy with what you're using, then enjoy!