I am searching for the note taking app with the same criteria and right now i am using Cryptee (browser based, no app) and trying to like Joplin. Sometimes Cryptee is slow at startup, but has web app, encrypted, is simple to use and has 2fa. Joplin is fast, supports cloud storage of your choice, but has awful sync issue. When you have some notes uploaded and synced and decide to reinstall the app in your phone and sync it again, your notes will be lost.