When comparing Plan 9 vs CRUX, the Slant community recommends CRUX for most people. In the question“What are the best operating systems for advanced users?” CRUX is ranked 11th while Plan 9 is ranked 22nd. The most important reason people chose CRUX is:
It uses the BSD ports system as package manager.
Specs
Ranked in these QuestionsQuestion Ranking
Pros
Pro Well designed
Plan 9's design is very orthogonal and well done.
Pro Designed to allow for multiple computers to work as if they were one
With Plan 9, computers are turned into terminals where you can access files and processing units which can be located elsewhere. Data storage is handled by another external server. This means that instead of each person having their own individual computer with all the required parts, all of the computing and storage is done in a central area and everything is networked in together.
Pro Ports
It uses the BSD ports system as package manager.
Pro Very BSD/UNIX-like
Pro Learning
Nice if you want to learn some stuff about Linux.
Pro Very knowledgeable and helpful user comunity via IRC
Cons
Con Difficult to use software made for other systems
Plan 9 is very different from most other operating systems, and as such it's extremely difficult to bring in software designed for other operating systems ('porting').
Con No fully featured web browser
As indicated on the official Bell Labs webpage, there is no full featured web browser currently working on Plan 9, except abaco.
Con Not supported by most tools
Not supported by most dev tools beyond text editors.
Con Very small user community
Con KISS
You have to do everything by yourself, there are no helpers!