I haven’t distro hopped much in the past few years, so I am near clueless. I know that Linux Mint has a graphical updater and I vaguely remember openSUSE having it, though I’m not so sure on that one, because as I mentioned, it’s been a while. Especially curious if any Arch-based distros have it.
openSUSE Tumbleweed has a graphical installer you can use to install, remove, update applications, browse, search, etc. But you still need to run a command line ‘zypper dup’ to fully update the system.
Tumbleweed has Myrlyn or Discover.