I was thinking of switching from Apple TV to an android tv device once I saw the new google tv UI I was wondering what devices support the new UI besides the new chromecast? And I want a device where I can toggle HDR off because my tv looks weird with it on but also keep 4k content on like u can with Apple TV.
The Nvidia Shield Pro is the only Android TV box that's good to give you the premium experience that Apple TV does. Any other box is going to be a step-down performance wise. How important that is to you depends on your particular needs.
Unfortunately (or fortunately, depending on your POV), it's still running the old Android TV UI and hasn't been upgraded to Google TV yet, but certainly will eventually. And like most devices, you can't toggle the HDR on and off. Though if you have an SDR TV, it will tone map it to SDR.