Personally, it provides me with 100% familiarity with my work systems that I am responsible for (1500+).
Historically, it is what I am used to. I began my Linux journey around 1994 using Red Hat.
Really, the main thing that is different between Fedora and Ubuntu is the package manager, and some slight differences in the filesystem layout and usage. Once you put a GUI on your system, they are pretty much identical, from an end-user point of view. They are quite different from a systems admin/support point of view.