The streaming performance of the smart tv will always be stogy compared to a streaming box like ROKU or chromecast. And the streaming channel choices on the smart tv will be limited compared to ROKU.
If you get a dumb tv plus something like a ROKU 3 the total cost will will be less than that of a smart tv and the streaming performance better.
Smart tv makers are first of all in the business to sell tvs. ROKU is in the streaming business.
There is very little live major network tv available with streaming, smart tv or ROKU. We watch WMUR news live by streaming to the laptop and and connecting to the tv by a HBMI cable.
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