Ok, so I grabbed a Stream 4k hoping to solve some of my problems with the Fire Stick 4k. I'm a former Sheild 2017 user (loved it, but I wanted a consistent interface on all TVs and the Sheild is too pricey and I often had little issues).
After a few hours my hopes are dashed.
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Atmos plays only on Jack Ryan 4k (just like fire stick)
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HDR is randomly washed out
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Super Glitchy - stuff randomly flashes and doesn't work
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I can't play a single thing from Google Play movies
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Vudu Cannot play UHD
I really want androidTV to be a thing, I have about a dozen Google homes, and Android phone, tablet, etc. But this, my shields, my Hisense and Sony TVs have all been worse experiences than FireSticks. I don't know if androidTV will ever be ready for prime time without a complete re-write...
I will keep playing around, hoping Android just needs some time to settle in, but it's not looking good.
Your experience has definitely been odd with devices. I've had fire sticks and I have two Shield TVs, the fire sticks were always slow, laggy, buggy, required constant restarts, I stopped using them entirely. The Shields have been almost bulletproof. My 2017 would very occasionally lose wifi, but a reboot fixed that and it only happened 3 or 4 times. Beyond that, they've been flawless.