I've briefly analysed ProseMirror as well as Quill. IMO ProseMirror seemed well built with better literature compared to Quill. ProseMirror's author has truly

I've briefly analysed ProseMirror as well as Quill. IMO ProseMirror seemed well built with better literature compared to Quill. ProseMirror's author has truly thought out every API and has got most of the details just right. For example, if I ought to build a grammar checker on top of Quill vs ProseMirror, I couldn't find any APIs in Quill that lets us decorate the view with grammar errors and suggestions, without polluting the core data-model with custom nodes/attributes. ProseMirror on the other hand had the concept of Decorators (https://prosemirror.net/docs/ref/#view.Decorations https://prosemirror.net/docs/ref/#view.Decorations) for such a case. That was just one example. More from the author of Quill himself: https://news.ycombinator.com/item?id=15468402 https://news.ycombinator.com/item?id=15468402