Check out this in depth comparison of all the text editor applications available for iOS presented by Brett Terpstra.
This is a feature comparison of text editors on iOS. 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.
Hint the link below to view the chart and filter apps by the features you need most.
This is pretty much impossible to interpret without going into a level of detail that is impractical for 99% of interested parties. It would be so much better if the information could be rendered in a readable graphic format, or, perhaps simply summarized by eliminating apps that fall outside one standard deviation. Can I say that?
I saw the pink/green representation, but don't find it very helpful either. Unless you've delved into the details of some of these apps, both this and the more graphic representation are indecipherable.
I'm sure there is a better way to represent this information visually.