I have both, Apple TV 4K and Shield TV Pro, both have strengths and weaknesses. Being able to use my AirPods with one click on the ATV is super nice, I also use it for Apple Music (with Atmos). The Shield is more capable, I am using Projectivy Launcher, autostart Plex on boot and it just works with all the codecs I ever needed. The ads are bad, but Android still allows you to change the Launcher (you only have to uninstall the stock launcher with adb shell pm uninstall -k --user 0 <package> ).