Would it be safe to reset old Apple TV to factory, plug in the new one and have all the info from the old one intact?
That's a total pain the a** - they should transfer logins as well - but they don't.tvOS doesn't backup app settings or system settings. You can enable the One Home Screen setting on your old Apple TV and it will setup the new one with the same apps and home screen order. But you will have to re-login to evrerything.
Good to go.I would definitely plug the new one in first, get it the way you want, then wipe the old one.