When comparing Texts vs Markdown Edit, the Slant community recommends Markdown Edit for most people. In the question“What are the best open source Markdown editors for UNIX-like systems?” Markdown Edit is ranked 25th while Texts is ranked 29th. The most important reason people chose Markdown Edit is:
Licensed under MIT.
Specs
Ranked in these QuestionsQuestion Ranking
Pros
Pro Supports multiple Markdown dialects
Unfortunately, this is a global setting for save (it can open any dialect)

Pro Immediate Markdown rendering and preview
Texts immediately renders the formatted Markdown as you are typing it inside the text box. It's quite similar to a WYSIWYG editor.

Pro Imports and exports many formats
HTML, Word, TeX, PDF, ePUB, OPML.
Pro Works on Mac OS X and Windows

Pro Free and open source
Licensed under MIT.
Pro Real-time HTML preview with synchronized scrolling
Markdown Edit is split in two panes. One pane is used for writing Markdown, the other shows the rendered HTML as it's written.
Cons
Con Overwrites standard Markdown
Editing a preexisting Markdown document overwrites standard markup in it (for example, interpreting headings marked with leading "#"s and rewriting them with a trailing underscore line), adds extra blank lines between all paragraphs, and adds extra spaces at the head of unordered-list items.
Con Spell checking is not activated by default
There's a built-in spell checker which is not activated by default and is quite hidden.
Con Limited choice of built-in themes
You can download the CSS for these themes and create your own, but would be nice to have more flavors (e.g. GitHub)
Con No word count in older versions
Word count is present in Texts 0.21, at least.
Con Dead project
Con Covers taskbar when maximised
When maximised, the window covers the taskbar completely even when the taskbar is set to be on top of other windows.
Con Does not support pasting images from the clipboard (unless online)
This editor boasts that it's a desktop (i.e. offline) markdown editor where you can copy and paste images directly in the editor which is a feature that many other markdown editors struggle to implement. Unfortunately this is misleading, since the only way to paste an image in the editor is to be online. If, like many of us out there, you want to work offline, this feature will be broken as it requires an internet connection, which is weird for an editor that boasts being a desktop app!!
