A:Answer Those are all operating systems. Tizen TV are made by Samsung. Google Android TV are made by brands like Sony and Sceptre. Roku TVs are made by brands like Hisense. Reach operating system has its own perks. Google TV, Tizen TV, and Fire TV allow you to download video/music apps. Google TV also allows you to download games to the TV. In my experience, Google TVs can get buggy and may need to be rebooted often, Fire TVs can have connection issues right out the box (even when hardwired to the router), Tizen TVs are the smoothest I've used so far (no bugs or glitches for the 60 days I've owned mine). I have no input on Roku TV, as I haven't used one, and don't plan on it. I know they come pre-loaded with at least 10 video/music apps that can't be removed, but I've never used one