1. Joplin has no web version. 2. Joplin's so-called "encryption" is not their main focus 3. The organization features are barebones (without plugins) 4. Their export format (JEX) is horrible. 5. Their "cross-platform" apps are also not 100% cross compatible.

There's a lot missing in Joplin. Notesnook is not going after Joplin though; it has already crossed it in terms of privacy, security, portability, and UI.