I have Fedora KDE Plasma 40 on a laptop with a nVidia chipset, (I need to have it defaulted to Nouveau and the base Intel chipset). Maybe by the middle of next month they MIGHT have something cobbled together to get a decently working experience for the majority of users. Otherwise, don't be surprised if your screen flickers, has missing parts of your display, or just a black and blank screen.
Wayland and nVidia - two piles of stupid that are meant for each other.
Technically not a distro, but give Bazzite a try. It's probably the most hands-off gaming experience on Linux. Valve employees also make contributions to it.
I just use Debian, KDE is an option during install and I use it. However, my brain lacks wrinkles so I'm sure it could be "better" on a more purpose built gaming distro. Over the decades of on and off Linux use, I always end up on Debian because it feels like solid ground to me