I'll start with:
GNOME has an uncomparably bigger userbase mostly uses two workflows(the vanilla workflow and the Ubuntu one) with a big emphasis on the latter meaning basically that there are fewer bugs. GNOME has more corporate backing and focus leading to generally less bugs as well but not any game breaking features. GNOME is also used as the default on most distros which means a surplus of talented developers(For example look at the performance improvements by the Ubuntu developers in 3.32 and 3.34). Wayland has been the focus for quite some time which means basically that Wayland is plainly better on GNOME. As for the workflow itself, GNOME is a lot more keyboard centric but at the expense of being harder to navigate with the mouse, especially since it lacks a default dock. Personally, it gets very hard to switch when you have a lot of windows of just one program active even using the Expose/Mission Control like Activities
KDE has a smaller userbase which use an inestimable number of workflows(For example: Windows XP default, Windows 7/10/Manjaro and macOS-like using Latte dock). Lots of features added around even small releases mainly due to a very BIG number of KDE volunteers who might make it seem like a community project. BUT due to the big number of workflows and number of features there are usually more bugs. Qt is at an advantage due to cross-platform usage. Wayland has only recently been an important focus for the KDE project, so they're lagging behind quite a bit. The default Windows XP like workflow is very mouse centric. A lot of things are impossible without a mouse which isn't actually bad in this GUI centric world.Personal opinion: KDE has two main shortcuts for CTRL+F9(or 10) called Present Windows which is very good for switching a small to medium number of windows like Activities but not good for anything else. And the very lacking CTRL+F8 Desktop Grid which is very hard to use properly even on a low res screen. it seems KDE is very much focused on using the bottom panel/taskbar,very traditional and manageable. I personally prefer the Icon-only Task Manager because it's simply the best for me when managing 30+ windows. Even when choosing between macOS and Windows, I always go for Windows due to the taskbar being very very good for this kind of stuff.
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