Don't know how to solve your problem but I too recently made the switch from gnome to KDE and I really do love everything they do design-wise. Everything being so round in gnome for some reason makes me feel like I'm in a childrens playspace haha
Honestly, who cares? The best system is what you feel most comfortable with. The fact that we have options and everyone can choose and tweak to their liking is the most important.
As a long-time Windows user, things like settings or notifications are laid out much more logically, as well as I feel like everything in KDE is just a little better integrated than Gnome. Also a lot faster for me to get it to a point where I feel like I like it, and it seems to use a lot less system resources (although it's been a couple years since I daily'd linux, so it's possible that's different on Gnome these days).
But otherwise I don't have a whole lot of specifics, it just feels a lot more mature in general, like I don't have to search for anything I need DE-wise, it's always right where I'd expect and extremely well-built. And any extra functionality from add-ins works nicely.
What's the best way to export everything? The name of the theme I used is in the info panel there but if there's a way for me to export everything as I have it set I'm happy to help.
Otherwise I can get all the names of the different themes for ya.