When comparing Cygwin vs Rapid environment editor, the Slant community recommends Cygwin for most people. In the question“What are the best power user tools for Windows?” Cygwin is ranked 19th while Rapid environment editor is ranked 27th.
Ranked in these QuestionsQuestion Ranking
Pro Additional packages available via Cygwin Ports project
Pro Better default terminal
Cygwin's default terminal "Mintty" is far better than CMD.
Pro You can run graphical applications
It has X Server.
Editing of Windows environment variables is easy, splits long lines.
Displays wrong entries in red, e.g. paths that do no longer exist.
Pro Resolve variables values, make easy a refactoring of PATH by extracting different elements in their own new variable
Con Many incompatibilities
A lot of tools don't actually work with Cygwin, and documentation is often sparse, so for many use cases, it's worth the small bit of extra effort to just run a full virtual machine.
Some may not consider it a "power" user tool.