When comparing GNU+Linux vs Haiku, the Slant community recommends Haiku for most people. In the question“What are the best Operating Systems for x86 PCs?” Haiku is ranked 2nd while GNU+Linux is ranked 7th.
Ranked in these QuestionsQuestion Ranking
It is a Unix clone.
Pro Many different desktops to choose
Just use whatever you want. Some are lightweight, others are full of extravagant features. There is a flavor for each taste.
Uses the same userland as other GNU variants.
You don't have to pay anything.
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 Runs perfectly on old Hardware
Con GNU Copyleft
The coplyleft in the GNU licenses make it unattractive to many developers. It s also impossible to port GPLed Linux improvements to other more open operating systems like BSD or Haiku.
Con Many distributions
There are just too many of them to know.
Con Often limited by decisions of the Kernel developers
Support for the latest features in Linux is often limited by their kernel developers, for example, Nvidia once had added patches to support Optimus on Linux, however, the kernel developers rejected those patches resulting in still no official Optimus support for Linux.
Con Frankenstein OS
The whole OS is mixed together with software from different sources.
Con No interface Guidelines
Since there are plenty of X11-Desktop environments and two big Widget Toolkits, every app works and feels differently.
Con Most Distributions are not LSB-conform
The most Distributions don't follow the Linux Standard Base which results in different package formates, package management tools, bootloaders, init-systems or even filesystem hierarchy standards.
Con Most 3D drivers are not as fast as their Windows counterparts
The only display driver that comes close to their Windows counterpart is the nvidia driver. Both AMD and Intel drivers miss a Control Panel on Linux to adjust more settings than just your resolution they also usually much slower than their Windows counterparts.
Con A big mess
10-15 years ago I had everything working on my linux system bluetooth, graphic driver desktop etc.
Nowadays it is just a big mess: Distributions force me to use systemd a system I don't like since it is terrible to debug, KDE and GNOME(and its siblings) have moved even further away from each other no unlike years ago when they used freedesktop to unify things. There are now dozens of different GUI toolkits o choose every one with they own themes and usability(not to mention all the different minor versions like gtk2, 3,4 whatever that look and work all differently). in 2005 i could use bluetooth audio with alsa and no issues on every DE or WM nowadays you need pulseaudio to get it working some applications even need it to play audio. All distributions use different packaging formates (but they do and work all the same). You have now traditional apps and flatpaks, snaps and appimages. There are desktops/distributions that come with wayland preinstalled and the majority still uses X.org.
It's only a clone and some things work differently.
Con Not secure
Linux is actually the least secure OS and it is a security nightmare. Windows, MacOS, and ChromeOS are all far more secure.
Con No graphical user-interface
As the most unix systems this also comes without a graphical user interface by default.
Con No one uses it
It's a very niche OS that no one uses.
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.