For iOS devices, the interface of the Apple TV 4K is very same. Since it is so simple, even Android users can understand it. Users like the ease of use and smooth interface of the Apple TV 4K. On the other hand, Roku Ultra is simple to use too with Smart TVs, but the interface of Roku is a little bit more outdated. It is very easy and simple to understand, but there is quite a big ad on the home screen that users cannot opt-out of.