to me Workstation conveys a machine that is destined to do some sort of work, or be used in the production of something. My company laptop is my "Workstation" as I use it mainly for getting work done. I don't use it for personal use (OK, --rarely-- use it for personal stuff), and I have a different work flow when using it. However, on my personal machines, I refer to them as my "desktop" for my big box computer, and my "laptop" for my laptop. Hardly any work gets done on these, save for personal "fun" stuff.
In the essence of what Fedora Workstation is targeting, I would think that the name Workstation is best suited. We are targeting Developers and Sysadmins who get work done, much like the work I do on my company laptop "workstation".