Apple Music makes the strongest early shortlist for people who already use iPhone, AirPods, Apple Watch, HomePod, CarPlay, or other Apple services as part of everyday listening. Those are the users most likely to feel the service's strengths quickly rather than having to talk themselves into them.
The opposite test matters just as much. Apple Music is usually a weaker first choice for people who want a permanent free tier or who care more about Spotify-style discovery and social playlist culture. That does not make it bad; it just means its strongest arguments are aimed somewhere else.