When comparing Cortana vs Rapid environment editor, the Slant community recommends Rapid environment editor for most people. In the question“What are the best power user tools for Windows?” Rapid environment editor is ranked 24th while Cortana is ranked 74th. The most important reason people chose Rapid environment editor is:
Displays wrong entries in red, e.g. paths that do no longer exist.
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Pros
Pro Can recognize music
You can ask Cortana what music is playing and she will attempt to identify it.
Pro Will let you know when artists you're interested in play in your area
Cortana monitors your Bing search history, social network actions, music played, etc to find out what are your favorite artists and will let you know if they plan to play in your area.
Pro Warnings
Displays wrong entries in red, e.g. paths that do no longer exist.
Pro Easy
Editing of Windows environment variables is easy, splits long lines.
Pro Resolve variables values, make easy a refactoring of PATH by extracting different elements in their own new variable
Pro Convert variables between verbatim and expandable
Windows supports referencing variables within variables, but only if they're marked in the registry as expandable, and conversion between the two types is exposed in the context menu for each variable.
Cons
Con Functionality is limited on non-Windows devices
While Cortana is available on Android and iOS, certain features on those operating systems are either limited or non-existant. For example, there's no hands-free voice activation on iOS, and on Android it's only available on the homescreen and nowhere else, etc.
Con Simple
Some may not consider it a "power" user tool.