We have had quite a long and rough ride in search of a stable rich text editor. We began with Quill.js then migrated to TinyMCE and then finally settled on Prosemirror. Unfortunately, contenteditable is still absolutely horrible on web browsers, especially mobile ones.
Tiptap is a good choice if you are looking for a framework agnostic and thin abstraction over Prosemirror. However, if you are primarily working with React you should go with Remirror[1]. Tiptap's APIs are heavily inspired by Remirror (almost a duplicate in some places). Remirror takes the edge on the maturity and stability of the API and extensions. The sheer number of utilities offered by them to simplify Prosemirror's APIs is astounding. And trust me, you will need a lot of those utilities eventually. Prosemirror is not an easy API - really, really well designed but not easy.
In the end, though, its Prosemirror that's doing all the heavy lifting. And no matter how many abstractions you put on it, you will have to get really, really close in with Prosemirror's internals. Tiptap or Remirror do not make that any easier or harder aside from the initial bootstrapping.
---
Edit: almost forgot this but the only real selling point of Tiptap is their extensive documentation.