I have tried Roku, Fire TV, Chromecast (not the new models with an interface), and AppleTV. So far Apple TV is the cleanest without ads or sponsored content on the home screen.

If you find something better please let me know.

That makes sense. I have a very simplified setup currently, the next addon was going to be jellyseer but now I have another option.

Can you explain why you use jellyseer and reiverr?