Amazon is great at specific UX functionality but not so great at high-level information architecture.
Prime Video has a superior video player to Netflix thanks to the XRay feature which tells you which actors/songs are currently playing/acting during the current scene. I've used it countless times.
Speaking of Xray, for sports it would be great to see which players are currently on the field/court during a game, including which jersey number, and if possible the box score when you hover over the game. That would have been amazing during NCAA March Madness where I didn't know most of the young college players.
The only thing missing from the Amazon player which Netflix has is "skip intro credits" button.
I love this technology/product competition between the two none-the-less.