With a bit of fiddling, Android TV can be as good as Apple TV in terms of privacy. Not out of the box, of course, but ADB can remove advertising/surveillance related APK files from most devices sold in big box stores and there are open-source, alternative clients to YouTube and a few other platforms available due to the popularity on the underlying AOSP platform. The same is possible to varying extents on smart TVs that use Android TV as their OS.

You can even completely replace Google's sponsored-content-feed launcher/homescreen with an open source alternative that is just a grid of big tiles for your installed apps (FLauncher).

For me, SmartTube with both ad-blocking and sponsor block is the killer feature of Android TV as a platform.

If you're into local network media streaming, Jellyfin's Android TV app is also great. Their Apple TV app is limited enough that people recommend using a paid third party client instead. And that's usually inevitably the case with Apple's walled gardens... The annual developer fee means things that people would build for the community on AOSP/Android are locked behind purchases or subscriptions on iOS and Apple TV.