The first time that i see apple tv menu. It looks really smooth. I have an xiaomi box 4k and is totall pile of rubbish because when it goes in sleep mode it immediately crash and cause the sound to be muted.
The Apple TV is pretty smooth and it also does not get iCloud lockes like iPhones does. I have had no issues with my Apple TV except for the touch pad on the remote some times it does not function right. I believe it has a iPhone 6s chip in it the one I have fully updated and is frome 2017.