Schaller wrote about how the overall consensus of Fedora Workstation with its few releases now is that its very stable -- much better than the older Fedora Linux releases. I certainly agree so -- at least if using the GNOME-based desktop of Fedora Workstation -- that Fedora 21 and newer have been rock solid.
Fedora Workstation stability has been hitting the nail on the head thanks in part to relying more on the Fedora retrace server for bug fixing prioritization, being more careful about new code that's included in Fedora Workstation, and regularly checking and identifying important bugs.
More details on their processes for driving quality and stability into Fedora Workstation can be found via this blog post. As part of the post, he also cites the new Wayland-by-default status on Fedora.