One advantage of calibre companion as the on device librarian, is that it can fetch both kindle and epub formats, put them in different folders, and will call up what you set as the default reader for each. So if I wanted it to open my books in bookari, not moon it's just a single preference change.
Just be careful where you do deletes so as not to confuse.e.g.when I finish a book in moon I remove it from recent, agree that moon should also delete it,and then I go into cc and delete the now empty record, so that cc database is valid.
I gave up with bookari sync long ago. It would get hopelessly confused across 2 devices if I edited a book in calibre and tried to add the changed version to a device.
Cc Has some decent librarian functions,. But I don't use them. I just have a few books in progress on two tablets, with calibre on pc keeping the master copies.
I mostly use the kindle for Android app for stuff from Kindle unlimited that I will not be buying to keep.
When I buy an Amazon book I always convert to epub and store that in calibre, read it in moon..
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