Ranked in these QuestionsQuestion Ranking
Pro Supports code highlighting
Has syntax highlighting for more than 120 programming languages.
Pro Has more features than just a simple Markdown editor
Quiver is a notebook and note-taking app akin to Evernote which happens to also be able to edit Markdown files. As such, it has a lot of useful features such as: image support, file attachments, web content support and more.
Pro Supports vi keybindings
For people used to vi keybindings, Quiver can be set up to work with them.
Pro Notes can be linked to each-other
Quiver notes have unique links that can be copied and pasted into other notes to gain quick access between them.
Pro Cloud syncing
Dropbox, iCloud Drive, Google Drive, or any other file-based cloud services.
Pro Live preview
Quiver has live preview for both Markdown and LaTeX. This helps users to better understand the way they are formatting their files.
Con Much more than a simple Markdown editor
Since it's more like a note-taking app (and a note-taking app built for developers) than a Markdown editor, it may be a little excessive to use it only for its Markdown editing features.