When comparing Markdown Edit vs Notable, the Slant community recommends Notable for most people. In the question“What are the best open source Markdown editors for UNIX-like systems?” Notable is ranked 24th while Markdown Edit is ranked 25th. The most important reason people chose Notable is:
Simple tagging support is easy to use, and allows quick searching through multiple documents.
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Pros

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.
Pro Organize projects with tags
Simple tagging support is easy to use, and allows quick searching through multiple documents.
Pro Simple, clean interface
With a clean UI that lacks clutter, you can get right to work without a bunch of distractions.
Pro Supports markdown
Uses GIt-flavored Markdown, which is a popular and easy to use WYSIWYM format.
Cons
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!!
