KaOS is a distribution that lately is being very popular for its enormous power and simplicity that makes the user have a beautiful environment but without wasting resources. The KaOS distribution is not based on any specific distribution but it does use parts of the most important distros, thus, its packaging is governed by Pacman, the ArchLinux package manager, but when KaOS is loaded, gfxboot appears which is from OpenSUSE and also uses Systemd which is from Fedora ... and so on.
KaOS focuses on the inclusion of the KDE desktop and offering its user the latest, something that it is comfortably fulfilling and that I think is giving it quite a success. As you may have noticed, KaOS is a rolling release distribution, which means that it is constantly updated.
KaOS currently has the latest KDE packages and many other applications such as Gimp, Libreoffice, Vlc, etc…. In the case of the Linux kernel, KaOS follows a curious but simple system. The development of the kernel is divided into two: stable linux and next linux. The first offers a fully tested and stable version of the kernel, the second offers the latest kernel, which they test, add patches and test until they move to stable Linux, this process usually lasts about six weeks.
KaOS needs an advanced user to be able to use it without problems
To know or say if KaOS is your distribution or not, the best and most recommended is that try it, either on an old computer or on a virtual machine. However, as they warn on their website, KaOS is for those users who have tried several operating systems and / or distributions and are looking for something simple with a single desktop. In addition, the base equipment to be able to install KaOS must be after 2005. Mainly KaOS is developed for 64-bit systems although it still has 32-bit packages.
I personally tried it a long time ago and was impressed, not only by the results and performance but also by the little publicity that this distro receives and that it well deserves. So if you are looking for a KDE distro, KaOS is one of the few distributions that you have to try.