When comparing Brackets vs Write!, the Slant community recommends Brackets for most people. In the question“What are the best text editors for UNIX-like systems?” Brackets is ranked 20th while Write! is ranked 22nd. The most important reason people chose Brackets is:
Brackets will automatically refresh the browser and load the latest saved version of a file open in the browser. This works with php as well. Editing a css will even highlight the tag that's currently being worked on. However, it only works with Chrome.
Specs
Ranked in these QuestionsQuestion Ranking
Pros
Pro Built-in browser live-updating
Brackets will automatically refresh the browser and load the latest saved version of a file open in the browser. This works with php as well. Editing a css will even highlight the tag that's currently being worked on. However, it only works with Chrome.
Pro Lightweight
Brackets is easy on memory usage and it starts up quickly.
Pro Free, open source and cross-platform
Brackets is entirely free and open source.
Pro Built-in extension manager
The functionality of Brackets can be extended via a simple-to-use extension manager. The extension manager also has a considerable number of extensions and themes.
Pro Can style a tag without switching over to the stylesheet
A feature called "Quick Edit" allows the user to select a tag in (a html file, for example) and edit the associated style without switching over to the css document. It also supports SASS and LESS pre-processors.
Pro Actively developed
Brackets is being actively maintained and developed.
Pro Popup previews
Hovering over colors hex codes or image paths will pop up previews of corresponding colors and images.
Pro Drag and drop support
Brackets supports drag and drop of text, as well as multi / rectangular selection.

Pro Can be hacked by any front-end developer
The editor is built using html, css, and javascript, making it extendable by any front-end developer.
Pro Multi-line (multi-query) editing
You can have your cursor independently on multiple lines and so creating templates and/or editing multiple things at once is really fast and easy.
Pro Vim mode
Vim-style editing is already built in the text editor.

Pro Support for Adobe PSD content
A default extension allows for the extraction of PSD resources, such as images and styles. There's good integration for placing extracted resources into source.
Pro Allows easily switching between working on multiple files
Write! has tabs at the top and a tree view on the left that allows quickly switching between different files.
Pro Interface doesn't get in the way of work
The interface is minimal, when it's windowed there are no buttons or toolbars, so it doesn't distract from work. When it's in fullscreen, there's just text, no interface at all.
Pro Endless undo/redo
Write! uses a file format that saves all versions of a document. Meaning even if the app is closed and then opened up again, Write! can restore any previous version of the document.
Pro Can double as a to-do list app
Write! has a to-do list mode that allows creating lists of items in groups (tabs) that can be ticked off when completed.
Pro Picks up where you left off next time you start the app
Write! saves the state that it's in when closed and restores that state when opened. You can pick up working on documents in the exact same place you left off - same documents open, same cursor placement, etc.
Cons
Con Still missing some elementary text editor commands
Some gaps have to be filled by plugins, while these features should be built in.
For example:
- Jump to matching brace (bracket / parenthesis);
- Gutter selection of lines;
- Recall previous searches / replacements;
- Autofill of search field with text under caret (text has to be selected);
- Show whitespace / end of lines / indentation guides / right margin;
- Selection to upper / lower case;
and some more.
Con Problematic updater
Though the website says there is an update available, the updater in Brackets may give you an error, resulting in you having to download updates manually.

Con Slow
Con Supports only web languages by default <but>
Brackets is built for web development and that's where it excels at out of the box. Other languages that have a CodeMirror mode can be added as well.
<and language support plugins can be added>
Con You need to login to the App, and it reconnects to their server
There is no offline use.
Con Not free
There are free markdown editors for windows, this is not one of them.
Con Needs better folder document management like Ulysses
Con Needs nested folders
Con Bad MarkDown features
Not worth $20, the markdown editor sucks.
Con In beta
The app is not yet complete. A lot of the promised functionality is not yet implemented.
