The main difference lies in the Alexa remote: the Fire Stick 4K Max includes an enhanced version with additional functionality, such as controlling connected devices and dedicated channel buttons ...
All five Fire TV Stick models have remotes with built-in voice search and control powered by Alexa. But if you're looking for something a bit more advanced, the Fire TV Cube may be your best bet.
First, the Fire TV Stick Lite only supports resolutions up to 1080p FHD. That means you won’t be able to watch 4K content at full resolution. And second, this model comes with the Alexa Voice ...
Fire TV Stick HD Amazon’s Fire TV Stick HD is its entry-level streaming device with Full HD (1080p) streaming and HDR support. This model also has an Alexa voice remote that includes TV controls.