Well, it’s rather simple from your point of view. You find a Spotify playlist that you like, copy the tracks, paste them into my app, and the playlist automagically appears in your Apple Music library. No need to sniff iTunes’ packets (sic!).
I don’t personally use Spotify so I can’t vouch for how good it is, but I’ve seem people give some positive feedback—it seems to be much less of a hit-and-miss than the others out there.