When comparing Haiku vs MorphOS, the Slant community recommends Haiku for most people. In the question“What are the best End-User desktops for Desktop PC's?” Haiku is ranked 3rd while MorphOS is ranked 13th. The most important reason people chose Haiku is:
After about 6 years since the alpha version, beta has been released on Fri, 2018-09-28. Check [here](https://www.haiku-os.org/news/2018_09_28_haiku_r1_beta1/) for release notes.
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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.
If you have used and loved Amiga, this is like classic Amiga but more stable and fun to use.
Super lightweight, start up takes less than 20 seconds on 10 year old hardware. Works on most PowerPC-hardware by Apple.
Pro Old Amiga software compatibility
I was surprised to see most of my must have Amiga software worked without problems here like AmIrc, ArtEffect and Personal Paint.
You can customize the GUI or download already made parts of GUI from MorphOS storage sites like this one here.
Con No one uses it
It's a very niche OS that no one uses.
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.
It's still in beta and quite unstable. Making it unsuitable for developing applications of any kind.
Con Lack of software
Compatible with most modern Amiga software compiled for MorphOS, but does not run modern Windows or MacOS software.
Con Entirely lacks in security
There's no security at all. All programs share the same memory. The system can easily get hacked, even by a less skilled hacker.