I prefer Apple Music overall. It has better integration with all my devices. Particularly with CarPlay- last time I used Spotify with CarPlay it was pretty gimped - there was a limitation on how many albums it could display, for example, and voice control is not as good as with Apple Music.
I also like that Apple Music lets me upload my own stuff that isn't in their catalog and then listen to it on my devices.
Honestly though, either one is great.
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