We adopted Debian after scanning all the distros available grading them
with max. weightage on "Programming Convenience" and "maintainability".
Debian "outperformed" all other distros with a great margin.
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Programming Convenience: With its abundant packages and its clever
interface (apt) it's pretty easy to install a library or search for one.
90% of chances you'll get in the repository. Moreover all the cleverer
tools of Programming (IDE, libraries, modules, modes etc.) you'll get
in the repository and moreso just an apt-get install <package-name>
does it all for you, you are back to coding.
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Maintenance: Debian rocks at Package Management. No distro gets
even closer to this. We've had nightmares going thru the "rpm"
dependencies earlier.
All our server/client machines in the Department run on Debian.