When comparing WriteRoom vs Marked 2, the Slant community recommends Marked 2 for most people. In the question“What is the best Mac writing software for novelists?” Marked 2 is ranked 11th while WriteRoom is ranked 14th. The most important reason people chose Marked 2 is:
Marked can show formatted text in real time. It can be customized with built-in styles, using your own CSS templates or as a multi-column view. You can easily switch between different style with keyboard shortcuts.
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Pros
Pro A selection of community submitted themes
WriteRoom can be customized with a selection of community contributed themes.
Pro Able to track your writing time and export it
Pro Plain-text and Rich-Text Format writing modes and export options
Pro Customizable real-time preview
Marked can show formatted text in real time. It can be customized with built-in styles, using your own CSS templates or as a multi-column view. You can easily switch between different style with keyboard shortcuts.
Pro MultiMarkdown & CriticMarkup support
Marked supports advanced functionality of MultiMarkdown as well as CriticMarkup.
Pro Multiple export options
Marked allows exporting to HTML, RTF, PDF.
Cons
Con No Windows or Linux support
Con No Markdown support
Con Only for macOS
This program doesn't work with other platforms besides MacOS, so Windows and Linux users will have to look for something else.