Red-Hat Linux Enterprise, CentOS and Ubuntu, with default window manager, is what I usually find on the customers I deal with.
On the cloud deployments it doesn't matter as they are accessible via ssh and cloud shells, and X Windows servers can be mapped to single windows.
Sure If you are talking average user.
Most of the people that I know that use Linux desktop are developers, and they generally don't use Gnome.
On servers sure its RedHat or CentOs or Ubuntu/Debian
But desktops are Ubuntu variants, then Fedora. Don't know anyone that uses RH or CenOS desktops.
Have been using desktop Linux for almost 2 decades, My last 2 workplaces have been Linux desktop centric. Helped deploy quite a few Linux workstations.
I don't know many people that use Gnome.
Most use either KDE or some tiling WM (or some custom fork of Gnome2/3 that looks nothing like default gnome).
When Ubuntu dropped unity, some people went to gnome, some stayed but at least in my circles most bounced off.