I just tried Mark Text and I don't like it because of the way it autocompletes closing symbols without being smart enough to let you overwrite them.
For instance, if I type [words it adds a ] after the cursor, and if I want to complete the section I have to use the arrow keys to move past its "helpful" insertion. The convention in most text editing software is that if you do helpful stuff like that, then pressing ] will be handled smartly, but in Mark Text, you end up with [words]] instead. I didn't spend enough time to see whether I could switch it off.
On a Mac, MacDown (which is also open source) gives you separate markdown and preview panes and makes a lot more sense to me if I want to see a preview. Usually I don't care about the preview anyway, though - the point of things like Markdown is that you're writing what you mean, not worrying about how it looks to someone who happens to be using exactly the same renderer as you. I think these "rich" Markdown editors are a step backwards.
I would say, preferences. 😊
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