Anime is a special case
Most television anime is produced at 1080p or below and upscaled, so the HD stream is the real one and a 4K stream adds little. The theatrical films are the exception: the Demon Slayer and Chainsaw Man films and the Ghibli restorations were finished for the cinema and look superb in 4K on a 4K screen. The year on the card is the quickest guide: a 90s series was mastered from film or from standard-definition video, and the HD release is the best it will look.
The tiers
720p and 1080p are both HD; 1080p is the full frame, and the difference shows on a television, not a phone. The service decides the tier from the master, your plan and the screen: 1080p on any plan on a phone or laptop, 4K on a 4K television on the plan that includes it.
Data
HD needs about five megabits a second and uses one to three gigabytes an hour; a twelve-episode cour in HD is about six gigabytes. On a data plan choose the service's data-saver tier, about half a gigabyte an hour, or download over Wi-Fi first. Buffering: drop the tier one step in the player.
