I got to choose which text editor we implemented in a large project a while ago and we ended with Quill, because of its easy customisation and contained feature set. The latter was a bonus for us, as we had to do much less checking for users adding breaking code to the page.

I do not envy rich text editor authors one bit. Even implementing them has an unreasonable amount of gotcha's when you dive into getting your page and the iframe/editor to communicate effectively.