Atom has a built-in package manager and an extensive [list of packages](https://atom.io/packages). Packages are written in CoffeeScript.
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Pro Frameworks support
Supports Symfony1, Symfony2,Yii2 & Zend frameworks.
Pro Multiple revision control system integration
Has built-in support for the most popular revision control systems
Pro PHPUnit support
PHPUnit is a testing framework. You can create test classes, run and see the code coverage directly from IDE interface.
Pro Composer commands inside IDE
The most used composer commands can be done directly from IDE.
Pro Free, open source, and cross-platform
NetBeans is a free, GPL-licensed IDE. It can run on any computer with a Java virtual machine. If a computer has a Java virtual machine (JVM), Netbeans can run on it. Netbeans can, therefore, run on a variety of operating systems such as Windows, *nix, and Mac OS. Being open source means that developers can contribute changes to the code to have the IDE better serve them.
Pro FTP/SFTP synchronization
Supports synchronization with projects stored remotely through FTP or SFTP.
Pro ApiGen support
ApiGen allows automatically generating documentation from specifically formatted comments. It's easy to use, supports traits, allows fuzzy searching for classes and highlighting docblocks using Markdown.
Pro Supports community plugins
NetBeans can be extended beyond the basic tool that you get out of the box through community made custom plugins.
Pro Best for PHP, HTML5 Apps Developemt
Pro Accelerated HTML5 development support
Pro Less and Sass Compiler support
Pro Linux terminal inside IDE
You can run Linux terminal inside the IDE.
Pro Supports Twig templates
NetBeans provides code completion and documentation for all Twig elements.
Pro Bower support
Pro ApiGen and PHPDoc support
Supports documentation generation through ApiGen and PHPDoc.
Pro Supports Smarty
Supports Smarty Template Engine right out of the box.
Pro Powerful debugging and performance optimization
Netbeans not only debugs your code, and points out errors but also gives you hints on which sections of your code could be further optimized.
Pro You can access source code history
There's a built-in local history that lets you compare code changes and revert to a specific revision. Helpful when source code file accidentally overwritten.
Pro JMeter benchmarking tool support
Pro Extensive list of packages
Atom has a built-in package manager and an extensive list of packages. Packages are written in CoffeeScript.
Pro Built-in package management
Atom was built from the ground up with the community in mind. Package management is therefore a first class feature.
Pro Free and open source
Atom is free, open source, and written in C++, LESS, and CoffeeScript.
Due to its modular design, almost any aspect of the editor can be changed. Even seemingly core packages, like those taking care of search and replace functionality, can be forked on GitHub, and changed and replaced in the editor.
The documentation for creating new plugins is also great, making it easier for developers to jump in and create plugins for Atom.
Atom can run on Mac, Windows, and Linux.
Pro Beginner friendly
One of the goals of Atom is to be a text editor for both experienced and beginner programmers. You can add keyboard shortcuts, change themes, install plugins, and change core settings by clicking through a GUI, or by manually editing config files the old-fashioned way. It has the added advantage of being built using the same engine that powers Google Chrome, so actions like opening and closing tabs feel familiar, even to new or non-programmers.
Pro Embedded Git control
Atom will highlight folders, files, and lines that have any uncommitted edits made. It also integrates really well with GitHub.
Pro Multi-line select and edit
Multiple cursors and column selection allow for versatile ways of editing.
ctrl + d will select the current word and each time the command is repeated, it adds the next occurrence of the word to the selection.
ctrl + click or
middle-mouse click will place another cursor in the place that's clicked. Cursors can then be controlled together. This also allows for selecting vertically.
Pro Command Palette support
The Command Palette permits fuzzy searching all available functions, settings, snippets, etc.
Pro Allows for instant file switching
By pressing Ctrl or Command + T and using fuzzy search, you can look for a file in your project.
Pro Command line integration out of the box
Installing Atom adds two command line commands -
apm. The first one runs the application itself while the second is the Atom Package Manager that's used to add and remove various components from the package listing. While these features can be set up with other editors as well, Atom takes care of them out of the box.
Pro HiDPI support
Atom has built-in HiDPI support with zero scaling issues.
You can theme and customize Atom to your liking.
Pro Vim plugin turns Atom into a modernized vim
Pro Modern feel and very customizable and extendable
Pro Best support for Arduino with Platformio
Arduino is the most important platform for developing embedded systems.
Con Tries to do everything for you and gets it wrong too many times
Con Slows down occasionally
The Netbeans IDE is known to take a large memory as compared to other lighter IDE's available on the market. Slowdowns can decrease productivity and cause frustration.
Con Development has stalled dramatically
It went down from two releases a year with minor bug-fix releases to one release and no fixes. There seem to be fewer features added per release as well. There is no activity in the plugin community.
Con Very slow startup time
Atom is very slow to startup, which is a big disadvantage if you are accustomed to using it to make quick changes on your files.
Con High memory usage
Atom has a relatively high memory usage, especially when compared to some other text editors not based on Electron. For those who develop on the go, this also tends to mean shorter battery life.
Con Has difficulty with large text files
Tends to crash or hang with large >(10MB) text files, making it less useful as a general text editor.
Con Slows down exponentially with plugins
Extending it needs sacrificing responsiveness
Con Doesn't handle RTL (right-to-left text) well
Text can't be highlighted and manipulated properly, cursor isn't displayed visually according to where it is logically (you have to type to find out), and similar issues.
Con No text UI
Con Not known when a new window will open
It's not really clear why and when a new window is opened when you open a file out of the tree view.
Con Depends on old software
Depends on python 2, which dies out.
Atom is not a native application. As such performance is subpar and the lag is especially noticeable on larger projects. It also opens a surprising amount of sub-processes and leaks a considerable amount of memory.
Con Missing additional touches
As Atom is still relatively new, it's missing nice little touches that other text editors have implemented over the years. From simple ease-of-use items like middle-mouse button multi-cursor select, to the ways pasted information from a spreadsheet is interpreted in multi-select situations.
Con Doesn't recognize some keyboards
Con Crash and data loss
I lost unsaved changes 2 times when the app crashes.
A bugreport about that was closed automatically after some time, nobody cares.