When comparing Standard Notes vs Zettlr, the Slant community recommends Standard Notes for most people. In the question“What is the best cross-platform note-taking app?” Standard Notes is ranked 5th while Zettlr is ranked 49th. The most important reason people chose Standard Notes is:
Notes are encrypted and secured so only you can decrypt them.
Specs
Ranked in these QuestionsQuestion Ranking
Pros
Pro Encrypted
Notes are encrypted and secured so only you can decrypt them.
Pro Extensible
Editors, components, actions, and themes.
Pro Open-source
Pro Simple
Faster and lighter than most notes apps.
Pro Cross-platform
Available on Web, Mac, Windows, iOS, Android, and Linux.
Pro Themes
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 Formatting enabled only as extension for money
Con Obtrusive, like someone WITH CAPS LOCK ON
Too loud, too much going on, and definitely an in-your-face sort of feeling.