I use and love both. KDE (Bazzite) on my desktop gaming PC, and Gnome (Bluefin) on my laptop for casual stuff, mostly YouTube.
KDE is a bit better for gaming since it has HDR and VRR and is the standard DE on the Steam Deck. I tried Gnome too just a few days ago, but it felt inferior in regards of gaming and content creation.
Gnome on the other hand has a place reserved on my laptop aswell as in my heart. Especially the ultra smooth and well thought out touch gestures and minimalist UI makes it perfect for laptop usage.
For me personally, I prefer Gnome over KDE. KDE is a bit more capable, but it overwhelms me sometimes. Gnome has a better concept and workflow for me. You either love or hate it, I do the first.
The least annoying launcher for your web browser