When comparing Eclipse Che vs Glitch, the Slant community recommends Eclipse Che for most people. In the question“What are the best cloud IDEs?” Eclipse Che is ranked 8th while Glitch is ranked 14th. The most important reason people chose Eclipse Che is:
Built-in terminal with root access so you can make changes to your running machines. Being able to SSH into the workspace so you can use a desktop IDE is handy.
Specs
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Pros

Pro SSH + terminal
Built-in terminal with root access so you can make changes to your running machines. Being able to SSH into the workspace so you can use a desktop IDE is handy.

Pro Custom commands
You can package up custom commands with your workspace and then use them (or share them) with everyone else.

Pro Docker runtimes
You can choose from pre-configured environments for Java, Javascript, C++, PHP, C#, etc., or you can define your own by dropping in a Dockerfile - makes it easy for simple and complex projects.
Pro GIT and SVN VCS support
Projects can be easily imported from any Git or Svn repository hosting service.
Pro Reproducible environment

Pro Portable workspaces
The workspace in Che includes project sources, IDE and the runtime. So if you hand your Che workspace definition to another user and they execute it they will get everything they need to build, run and debug the project.
Also the runtime is in a Docker container so it will work even if the second user is on a different OS than the original user who shared their workspace with them.

Pro Previews
Che does a nice job to automatically map the service:port running in the Docker container (e.g. tomcat on 8080) to the Docker port it actually uses (something in the ephemeral range). You never need to figure that out - it's just made available when you run your server.
Pro Merge tool for VCS

Pro Open-source
Pro Unlimited number of public and private projects for free
Pro Runs a server out of the box
Perfect for building web applications, be it client-only, server-only, or full stack.
Pro Private data are kept secret, even in public projects
Non-collaborators can't access private data (e.g. API keys) which are stored in a special file, and they are deleted when a project is forked.
Pro Persistent storage
Pro Multiple languages supported
Although the only official language/framework is Node.js, you can access the terminal and install other languages via apt-get (as long as it doesn't exceed the storage limit).
Pro VS Code integration
If you feel the built-in web editor is not sufficient, you can switch to VS Code and get the full power of its plugins. You still work with the files and server in the cloud, no extra setup required.
Pro It has a friendly welcoming community of builders
Cons
Con Slow runtime
Online IDE is much slower than desktop one.
Con No code prediction
