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.
I highly recommend it because it's the most used operating system in the world. If you work with other organizations or share info, it's easier if you have the same system instead of Linux, for example. Also, a large number of employees know how to use it, but not so many know how to use Linux or macOS.
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.
An all-purpose operating system for business or personal users. Overall, the OS is very user-friendly and intuitive, enabling even new users to quickly utilize the system. The same can be said about the apps within Windows. There is also good cross-functionality between applications, although the ease of use could be improved.
We selected Microsoft Windows because of the user friendly nature of it and a big factor is that other user never used macOS or Ubuntu so the productivity will decrease a lot because you have to explain a whole new OS. I always only recommend macOS or Ubuntu if you are a graphic designer of a developer. But for the day to day office work Microsoft Windows is the way to go.
