German company SUSE supports the Linux distribution, openSUSE. Leap is the stable and regular release option for installing openSUSE. New and experienced Linux users get the most usable Linux distribution and stabilized operating system with openSUSE’s regular release. Receive updates and harden the OS with openSUSE’s latest major distribution. Presented as the platform of choice for Linux developers, administrators and software vendors.
Debian is very well suited for application servers, web servers, file servers, hypervisors (personally, we use Proxmox for some hypervisors and this is based on Debian), and much more. It can run on various CPU architectures and scales well from large to small. We have Debian DNS servers running on Raspberry Pis, and large application and database servers running on powerful Debian installs in our racks.
If you want an OS that is rock solid, easy to manage, and predictable, Debian might be the OS you're looking for. The official packages are generally far from being bleeding edge versions, but this means that you are using packages that are battle tested and will not break compatibility at any point during its life-cycle. This, to me, is one of Debian's core strengths and a good reason for recommending it to others.
On the flip-side, the lack of up-to-date versions of various packages may be an annoyance if you actually do need to be using the latest version of such a package. If you need to be using more modern versions, you will need to remedy that yourself or look at an alternative distribution. Ubuntu may be worth a look, in this case, being that it is basically Debian with newer packages and some minor differences here and there.
Personally, I would not recommend Debian for a graphical desktop OS. You'll nearly always be better off with one of the Ubuntu flavors for a modern desktop with all the bells and whistles you'd expect with a GUI desktop.
It is a great system for running applications that are not "Windows only". It works very well with application servers like Tomcat or Glassfish. In the development environment, it can run many IDEs like Netbeans for Java or VS Code for Python. It is a great platform for running Docker or Kubernetes. It supports also full virtualization so Windows can be running inside a virtual environment to share the hardware cost.
Debian is one of the most well-thought-out, logical, and intuitive Linux operating systems you can use. Configuration, package management, file system layouts, etc, are all based on many years of usage, and it's very rare to find anything surprising or confusing in everyday usage. Package management and updates are handled by APT in such a way that once configured, you can almost guarantee your system will behave as expected for the lifetime of its service. Top-notch system integration provides all the tools you'd expect from a modern Linux system, with all the stability you demand from a demanding server OS.
openSUSE Leap has wide variety of already precompiled software packages in default repositories. It even has some specific packages in official repositories that are not available in other Linux distribution repositories. It is also very stable and reliable distro - we can predict when new versions will be released and when we should make system upgrades.
