You want Amazon Fire OS Devices (armv7a).
Amazon FireOS devices run an Amazon modified version of Android, so they get an Amazon specific version of the app.
The Amazon AppStore (armv7a) build is for non-Amazon devices that run “regular” Android. IIRC, it is the same as the Google Play (armv7a) version. People can download it from the Amazon store instead of the Google store if desired.
Also answered in your other thread. Closing this thread as a duplicate.
