My vote goes to Apple Music, one key benefit over Spotify;

Your own music and streamed music is available together in one place.

Example;
Spotify and Apple Music both don’t have the album Intimacy by Bloc Party, but I do

So I just synced it with my iPhone and it’s available together with the rest of my songs in Apple Music.

You can even store your own songs on the cloud and stream it, so you don’t have to use your phone space

I don’t think Spotify has this feature.

Also, some songs that I listen to are on Apple Music but not on Spotify, especially songs from Radiohead