Tobias from Supernotes here. Thought I'd give a brief overview.
In general, people switch to us for speed and simplicity. Supernotes is the only note-taking app out there that is based on collaborative short-form notecards rather than long-form files and folders. Notecards are themselves taggable, linkable, nestable, and shareable.
This modular approach to your knowledge is more organic, allowing you to quickly build out your thoughts and connect them together. We've got all the killer features you expect from a note-taking app, including real-time collab, offline mode, cross-platform (iOS, Android, Mac, Windows, Linux, Web), etc. So give it a try if you have a moment :)