Apple Music is usually capable of providing better sound quality due to its support for lossless and hi-res audio formats without charging any additional fees, whereas Spotify continues to offer a 320 kbps Ogg Vorbis stream even at its highest setting. Thus, with a quality pair of headphones or speakers, the sound coming from Apple Music will be purer and more detailed compared to Spotify, which is more oriented towards playlists, recommendations, and user, user-friendliness. So, if you value sound quality above everything else, then Apple Music would be the right decision for you.