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What's the best smart TV operating system
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None. Any "smart" TV won't be upgradable. It might get a few software updates but it will eventually be incapable of being updated enough to function as it used to with changes in services and codecs.
I have Roku and Fire devices, even on the "smart" TV. When the device isn't enough anymore I can just replace the device for like 20 bucks, not so for the built-in software on the TV.
And the TV itself doesn't get Internet. Shouldn't need a direct connection.