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The Apple TV box has a much better interface than any TV interface I have used to date. The Siri voice control, search for movie, actor, etc are quite easy to use on Apple box. Also the box as a Homekit hub, and can run other apps such as games, music, etc. Generally similar functionality on TV sets isn't comparable. If the only reason for Apple TV box is to watch movies, TV shows, then likely the LG/Samsung, etc can suffice.
Apple support document updated with 12.4 migration assistant. Previously a similar function was called Quickstart, which relied on iCloud or iTunes backups. https://support.apple.com/en-ca/HT210216 It also notes: ... If you're using the wired method, the transfer icon indicates that your devices are connected. You can also choose whether to transfer some settings, such as Apple Pay and Siri, from your previous iPhone to your new iPhone. If you have an Apple Watch and you're setting up a new iPhone, you'll be asked if you'd like to transfer your Apple Watch data and settings.