When comparing StackEdit vs Logseq, the Slant community recommends Logseq for most people. In the question“What is the best cross-platform note-taking app?” Logseq is ranked 22nd while StackEdit is ranked 28th. The most important reason people chose Logseq is:
Logseq is a privacy-first tool for thought.
Specs
Ranked in these QuestionsQuestion Ranking
Pros
Pro Works online and offline
StackEdit works within your browser. You need internet access to connect to the website, but once it's loaded, the site does not require an internet connection - you will be able to edit and save files locally. Additionally, you can use Fluid to turn it into a native desktop application.
Pro Supports various Markdown flavors
Supports standard Markdown and Markdown Extra.

Pro Simple workflow
It is very easy to toggle between the preview and the editing windows. The black makes it a very focused writing environment. Of course it's possible to change that if needed.

Pro Great when in full-screen
Pro No need to install additional software
StackEdit works directly from the browser, there's no need to install additional software as long as you have a web browser installed on your computer.
Pro Real-time preview
The preview shows in a collapsible pane on the right hand side.
Pro Instant publishing
StackEdit allows pushing a document directly to a list of publishing or file storage platforms or any SSH server.
Pro Multiple export options
Can export to .txt, .html and .pdf.
Pro Syncs via Dropbox and Drive
Files can be synchronized through Dropbox and Drive.
Pro Privacy-first
Logseq is a privacy-first tool for thought.
Pro Networked notes
Similar to Roam's technique of letting the notes flow with links to each other.
Pro Local-first software
Every topic is its own flat file. Nothing is better than keeping your data in the file system with an option of git source control or online backup.
https://www.inkandswitch.com/local-first/
Pro Daily journal is capture on Steriods
The daily journal feature allows you to quickly capture disparate topics under today's date and by way of tags make things organized and findable from any topic page.
Pro Open source
Logseq is opensource.
Pro Structured data over willy-nilly formatting
Lots of apps are too graphically flexible in how they allow content to be entered, placed, and formatted. They act like Word when what you want when authoring content is Markdown. Content and semantic structure, not graphical frills.
Pro Org syntax
Logseq support Emacs Org syntax out of the box.
Cons
Con Saves files in browser's local storage
Local storage is limited and if the browser crashes the text can be lost.
Con Cannot be accessed while being offline
Even though the editor itself works offline, you need internet access to open the website and the editor.
Con Lacks a good integrated spell checker
Uses the built-in browser spell checker which may not be as good as spell checkers other editors have. Depending on the browser, of course.
Con Publishing to GitHub requires giving write access to repos
In order to publish documents to GitHub, StackEdit requires writing access to your repos, something which many people may not be comfortable with.
Con Keyboard-driven editing/navigating is descent but average
It is only because I was a long-time Checkvist user that I say this. Checkvist has keyboard-driven controls which are in a league of their own.
Con Still in Alpha
Logseq is still in Alpha and is under heavy development.
