As he notes:
The information was compiled by the web community on an open Google spreadsheet. I cannot vouch for its current accuracy, but will be verifying everything as I’m able. It’s meant to help you find the most useful way to write, code or take notes for your personal needs. Every editor is geared toward a slightly different purpose, with their own strengths and focus.
There are a bunch there that I’ve tried, and many that are new to me, but the way Brett has created a chart comparing features is really helpful. There really is an iOS text editor for everyone, and his detailed chart makes that clear.