Companies like Vizio, TCL, and Hisense offer less-expensive TVs of all sizes with Full HD and 4K resolution. The major difference is the smart platform.Budget brands use other company's smart frameworks, like Roku TV, Fire TV, or Android TV. These tend to be slower than Tizen or WebOS. They may include sponsored content or ads.What’s more, processing speed and refresh rate are typically inferior to the brand’s upper end; color and brightness may not be as faithful, either.