Use Cases and Deployment Scope
I have used Debian OS since I inherited a personal desktop in 1995. I now run it on multiple computers at home, and my kids are more familiar with XFCE than Windows... I also use it on all of my web servers for my business. There have been a few hiccups over the years, though mostly were due to kernel issues that I would have seen on any distribution.
I used to run the "testing" distribution, but have migrated to the "stable" distribution, not because it is more stable, but I just want to spend less time upgrading.
I highly recommend Debian OS - very little "extra" cruft, and I have made lots of old hardware work that had been rejected by others as "too slow", but just needed a simpler OS on it.