I'd ignore the smart features as they're all shite (we develop CTV apps, they're really all just html 5 apps in a container) and get a Fire Stick or Roku. Samsung might be ok but they're about the worst for dropping support when they bring the next model out 6 months later.
They're pretty similar these days anyway, Samsung have their own thing with Tiezen/Orsay, Sony use Youview (which is better than the boxes because the boxes have pitiful memory, to the point they can't even play video over https) and everyone else uses Freeview Play.
LG make good telly's their posh ones (4k/HDR) frequently get recommended as good buys. Like everything it depends on the model.