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The one thing free and open source software users don't have a shortage of is choice. The diversity of the sheer number of software on offer makes the task of picking a Linux desktop all the more difficult. For instance, the Ubuntu and Fedora distros are a lot more than single end-user distros; they are complete ecosystems that cater to the broader open source community and power everything from handheld devices to large-scale servers. On the desktop front, both provide a good stable platform for other projects to build on.
If you're not a fan of Ubuntu's Unity desktop environment, you can still benefit from the distro's large software base by using one of its officially supported spins. Similarly, if you find Fedora too bland for desktop use, you can still benefit from its uniqueness by installing the Korora distro.
Despite an active community of contributors, Linux Mint is essentially driven by one individual. The project is primarily supported by donations and can't afford to spare much resources on anything other than engineering the distro in comparison with much bigger projects, such as Ubuntu, Fedora, OpenSUSE and Mageia. Furthermore, the best thing about Mint is its Cinnamon desktop, which is a key catalyst in its meteoric rise. However, Cinnamon is no longer a desktop environment that's exclusive to Mint, and is offered by several other distros, either as an official spin or in their repositories.
This leaves us with two RPM-based, KDE loving distros: OpenSUSE and Mageia. There's nothing inherently wrong with OpenSUSE, but it loses out to Mageia for non-technical reasons rather than technical ones. Mageia is championing the open source movement both on the software and the management front.
Mageia has learnt from the troubled past of its immediate ancestors and is managed in a democratic open source fashion. The distro also offers the widest choice of desktop environments with the aim of making it of use to the most number of users. On top of this, its users can manage their computers using configuration tools that have been worked on and improved for many years. The latest release also makes itself usable on the latest UEFI-enabled hardware.
All things considered, Mageia offers the best possible combination of choice, flexibility and ease of use.