When comparing Netrunner vs Haiku, the Slant community recommends Haiku for most people. In the question“What is the best laptop OS?” Haiku is ranked 31st while Netrunner is ranked 32nd.
Specs
Ranked in these QuestionsQuestion Ranking
Pros
Pro Everything works well out of the box
Works well. Very similar to my experiance with Manjaro.
Pro Beautiful and faithful KDE implementation
Modified but not overly tweaked (like BlueStar Linux or Ka OS).
Pro nice feel
Pro Always up-to-date
The "rolling" edition of Netrunner is based on Manjaro (an Arch derivative) which offers a semi-rolling release.
Pro Quick & lightweight
Surprisingly snappy for a fairly fully-featured distro.
Pro Netrunner Core is ideal for workstation
Netrunner Core is a vanilla version based on Debian Stable that only uses 400 MB RAM.
Pro Very fast
Pro Beta has been released
After about 6 years since the alpha version, beta has been released on Fri, 2018-09-28. Check here for release notes.
Pro Only need 512mb ram
Pro Stability
Pro Runs perfectly on old Hardware
Cons
Con Very heavy on resources
The heaviest Linux distro I've ever used. It often gets my laptop fan to fly.
Con No one uses it
It's a very niche OS that no one uses.
Con Unfinished
It's still in beta and quite unstable. Making it unsuitable for developing applications of any kind.
Con Language support is terrible

Con Small community
It is important when developing to be familiar with tools that other developers use. You can make any utility in any language you feel like, but if it's in an esoteric language that no one can read targeting a small platform that no one uses, then it was just something you did as a hobbyist, not as a developer.
This is not to say that Haiku isn't a great operating system to hack around on. Just don't delude yourself into thinking you're doing it to get familiar with tools that you need to know to be a better developer.
Con UI quite different to other OSes
