Good. Apple is great for me right now, but if I upgrade and get a new streamer/dac then I will end up changing over.I have both services and run them both with Roon. No complaints here at all. Never have an issue with finding the music I want to play. If one doesn't have the album the other does. And most albums are in different formats for comparison.
Good to know that neither service has problems with dropping out audio while listening. Napster started going mute while listening. I had to stop the song and start again. It was horrible. It had been good for over 10 years, but recently something went bad there.