It's arguable if KOReader is better. It does let you read epubs, but it doesn't affect what a Kindle does when you connect to WiFi. It has no metadata library, though it can search a Calibre saved file of it. But if you have Calibre and never connect to WiFi you can use azw3 (or KFX, but not easily on Linux) from epub.
KOReader is file browser based like non-library old PC programs, but lets you over-ride broken things in an epub. If the epub is sensibly formatted and converted to azw3 (or even KFX) using Calibre, then there is little value to KOReader and no sort/search by Author/Title or having collections with titles in more than one collection.
KOReader doesn't at all stop any Amazon activity on a Registered Kindle when WiFi is on and if a Kindle isn't registered it's a bit crippled even if it's jailbroken.
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