When comparing Whiskey vs Letterspace, the Slant community recommends Letterspace for most people. In the question“What are the best Markdown editors for OS X?” Letterspace is ranked 32nd while Whiskey is ranked 46th. The most important reason people chose Letterspace is:
This was a iOS first app and that is clear. Great swipe bar interface on iOS.
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Pros
Pro Simple
As far as Markdown editors go, Whiskey is pretty simple to use.
Pro Full featured iOS app
This was a iOS first app and that is clear. Great swipe bar interface on iOS.
Pro Simple, yet powerful interface
Keyboard shortcuts for basic text formatting. A few theme options. Full screen mode and swipe gestures.
Pro @mentions and #tags for easy organization
Pro Advanced Markdown support
Features Markdown support that many other text editors don't; such as Todo's ( -[x] ) and Strikethrough.
Cons
Con In beta
Whiskey is still in beta (as of September 2016) and might even be abandoned entirely.
Con No in-app Markdown preview
You can export to PDF or HTML with formatting, but no preview in the Mac app.