For anyone who’s curious: Universal Blue is a family of dozens of unofficial Fedora Atomic images. They all feature QoL additions such as rpmfusion codecs, as well as other software.
Aurora and Bluefin are their featured KDE and Gnome images. Aurora is just vanilla KDE with more preinstalled software. Bluefin tweaks the Gnome shell to offer an Ubuntu-like desktop.
I think these images do offer a better experience than the upstream Fedora Atomics. New users exploring Fedora Atomic will likely find these helpful.
On a related note, Secureblue, which we’ve discussed previously, is a UBlue descendant.