My vote is Fedora. It offers fresh yet stable packaging, and a polished experience that you can rely on. You can then use flatpaks for even newer apps, or opt to run Arch in a container with distrobox/toolbox and play with as many cutting edge apps as you want, all as if they were installed on the host.
Finally, if you like what you see in Fedora, consider trying Fedora Silverblue, Kinoite, or any of their other immutable distros.