https://www.theverge.com/2018/6/21/17483868/how-to-buy-amazon-fire-tv-stick-cube-4k

Which Amazon Fire TV device is right for you? That depends on what sort of features you want to have access to, as well as how much cash you’re willing to spend.

Each of the company’s three set-top boxes plug into your television’s HDMI port and provide instant access to the expected suite of popular apps and subscription services, from Prime Video to Netflix, Hulu, and the like. Beyond these similarities, though, they vary in fairly subtle ways that may matter to you, especially if you just bought a new 4K television.