I have a new TV and I’ve been trying to figure out sources and content as well.
From what I can tell the original PS4 will not stream 4K nor HDR. Supposedly the PS4 pro will stream 4K Netflix but not HDR? Google results seem mixed. I take it you have the original Apple TV and that’s no good either.
The apps on my Sony are pretty good. It bugs me that Netflix 4K starts streaming instantly at 480i and then builds up to 4K - as a new-found quality snob I’d rather it give me the loading screen for another 10 seconds and then go straight to 4K. Is that a setting? I want that intro video of Planet Earth II to look good, dammit!
For purchases or rentals, it seems like Apple TV 4K with Itunes movies has the best selection, at the best prices, plus better Apps first, and sometimes only on IOS and not on Android. They’ve locked in agreements to upgrade HD purchases to 4K for free, so you can buy an HD version with a bit of comfort if a 4K HDR version is released. So the Apple TV sounds pretty good, but it’s expensive considering I already have the other apps I want built-in, and I prefer Google services for my phone, PC etc.
Google (Movies etc) is behind, limited selection and they seem to charge more, also they don’t upgrade HD purchases to 4K. Yesterday I took advantage of the free 4K movie offer and chose Passengers. It looked amazing, 99% super happy, but a couple times in the movie there was some digital tearing, almost looking like buffer loss. My TV, my router / internet, or Google’s fault? Hard to tell. While Google is behind, I might just stay with them for awhile out of loyalty to the platform.
Also interesting is that the industry is aggressively pricing physical media, seemingly determined to not let the sector die. For example, relatively recent movies such as The Revenant is $20 CAD for UHD 4K, or Dunkirk at $30. So I’m tempted again to have a physical collection, even though it never really panned out for me for blu-ray. However it would require an Xbox One S, and if I were to get that I might as well get the X.
TL;DR - there’s pros and cons to all of the options right now.