After scanning community forums (XDA-Developers, 4PDA, GitHub) and testing multiple releases, the is the Bliss OS 14.x (Android 9) with Android TV interface or the LineageOS 16.0 ATV x86 builds.
Most x86 builds lack Widevine L1 certification. This means you may be limited to SD (480p) quality on official streaming apps. To get around this, many users use Kodi with specialized add-ons.
Here is the essential technical breakdown of why this ISO remains at the top of the list for enthusiasts. 1. The Core Architecture: Why x86?



