If you want the latest music almost immediately when it comes out, apple music easily. The delay that spotify has with getting music immediately is actually unacceptable. Even apps like deezer get it before spotify. Can be shown with albums like scorpion and nasir which took over an hour to be put on spotify unlike apple music.
If you want better radio systems, also apple music. Just so much better imo.
If you want better playlists and uploading your own songs and stuff, spotify is much better with that also. The system they use is much better than apple musics.
If you want to use it for free, then obviously spotify. its not even a contest. You cant even use apple music without paying