SongShift also works really well in my experience. I only use Apple Music in the car these days because its UX is safer/saner than Spotify's. SongShift makes it easy to keep them synced up.
Does it sync tracks that you Love in Apple Music? I have liked Apple Music a lot, except for one major thing when I realized that there is no way to view tracks that I have marked with Love, and I'm trying to find a way to get that information out.
That, I'm not sure about. I just use it to maintain an Apple Music copy of my "Liked Songs" via what they call a "Full Library Transfer" shift.
That may be what you're talking about, since clicking on the heart icon is how songs end up in "Liked Songs" to begin with...? Note that I only use it in the Spotify -> AM direction, not vice versa.
