Disney+ makes the strongest early shortlist for families, Disney-heavy households, and viewers who know that Marvel, Star Wars, Pixar, or classic Disney content will get regular use. 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. Disney+ is usually a weaker first choice for people who only dip into Disney-owned content occasionally and expect the service to work like a fully general-purpose replacement for every other streamer. That does not make it bad; it just means its strongest arguments are aimed somewhere else.