Thanks for submission! Very timely. Been searching for a stable and flexible editor (or rather a tool to build such an editor) and Tiptap looks like a good candidate.
I was also considering Slate, but have found this rather annoying bug https://github.com/ianstormtaylor/slate/issues/4833, which is surprising as it doesn't look like some rare edge case, and breaks something that seems to be like basic functionality for an editor. Had to re-consider.