When comparing Notable vs Zettlr, the Slant community recommends Zettlr for most people. In the question“What are the best open source Markdown editors for UNIX-like systems?” Zettlr is ranked 9th while Notable is ranked 24th. The most important reason people chose Zettlr is:
While many Markdown editors don't offer specific support for a certain type of workflow, or offer features for scientific workflows only, Zettlr offers features that help the writing process of journalists or researchers in the arts and humanities. It's a lot more text-focused than most editors.
Specs
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Pros
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.
Pro Focuses on writers
While many Markdown editors don't offer specific support for a certain type of workflow, or offer features for scientific workflows only, Zettlr offers features that help the writing process of journalists or researchers in the arts and humanities. It's a lot more text-focused than most editors.
Pro Citation support
While it supports a diverse range of syntax (chart, easy image insert, etc.) found in other editors, the great citation support made it possible to write real articles. Citation from Zotero and Mendeley can be inserted easily which is a huge plus.
Pro Almost perfect
This is the best option, still not perfect, there are some bugs like creating / editing tables and resizing images, but the PROS destroy the CONS, easy quotes, WYSIWYM , attachments tab (supports attaching and opening links to any file), table of contents, TAGs, easy hyperlink between files (same as citations), export to many formats (like Word, HTML5, PDF)...
Pro Renders math in-place through KaTex
Cons
Con Obtrusive, like someone WITH CAPS LOCK ON
Too loud, too much going on, and definitely an in-your-face sort of feeling.