Heh, its all the same *nix to me. I just need it to be relevant and updated in order to host Docker with half a dozen of apps. Your admin interface to the OS is more comprehensive and better for me than Cockpit-Project. It was some time since last I ran Webmin, but I trust and know you guys and your product.
Fedora, Debian, Suse, Ubuntu, Arch; sure I may have my preferences, but most will do the job and all will always have a some nuisance that requires a bit more labour.