There is no official or supported way to install Kodi onto an Apple TV. The closest approximation is the MrMC app, which is a forked version of Kodi that does not fully support all of Kodi's features. If your primary use-case is Kodi, why on Earth would you choose Apple TV; your best option is a small PC running Linux or any of the JEOS projects custom-built for Kodi.
(Until I switched to Channels, that is exactly what I did ... small HTPC with IR input running Kodi with media served from Tvheadend and a NAS, and shared media libraries with a local database server.)
If your media streaming is based upon illegal rights circumvention, then of course Apple is not the platform to consider.
The Apple TV does not support True-HD, and never has. Other "atmospheric", 7.1, or 5.2.1 content is supported, even Dolby Atmos. (But not True-HD content encoded as Dolby Atmos.) And support for pass through audio content has more to do with app itselfâKodiâthan the platform.
Yes, Apple has always had a closed ecosystem. However, I have no problems with external media support from other apps; Plex and Channels do a great job of delivering my saved content to devices both in-home and remotely, to both Android and Apple clients.
Also, the UX for streaming services in Apple devices always seems to be FAR superior on Apple than Android.
However, if the bar that must be met is whether you can full system access to the device itselfâsystem access and user "freedom" (however you wish to define the word, including making illicit activities easier)âthen you are better served with an Android device you can hack.