Nostr is the more powerful protocol and can create more complex, interactive documents because of the json structure.

Also, Nostr is the uncensorable protocol. As soon as it's notes, you can store it in relays, and then generate ePub (or markdown, HTML, LaTeX, etc.) on the fly, as needed.

Nostr means you could replicate a banned book or article to X number of countries and hundreds or thousands of relays, within a few seconds.