Sean Wolfe, compares Spotify vs. Apple Music for Business Insider:
The subscription prices are generally the same, there isn't much disparity in the music that's available, and on the surface the services all appear pretty similar.
But there are some important differences that will decide which music app is right for you.
This is a fairly comprehensive comparison.
I've tested Apple Music a few times and I always come back to Spotify. It is simply better as a music recommendation service.