linux distributions generally don't develop 'their' ui and all distributions worth using generally provide a large number of compositors, wms, or des to choose from.
essentially you just need to find a reasonable linux distribution based on repositories and package managers and set up the ui elements as you like. sddm and plasma are a reasonable starting point
while some people claim that arch is more difficult to use or requires additional troubleshooting, it is really very similar to the vast majority of other distros, especially if youre looking into in-depth customization of the desktop. arch and fedora have excellent package managers and expansive repositories. opensuse and ubuntu are also fine.
just run lsblk before dd