GNOME is the best performing modern DE outside of lightweight nice DEs.
This is straight up not true, GNOME is a memory hog and uses almost twice as much as KDE. I’m idling ~4% CPU usage on an i5 7300HQ, which is just barely better than yours. There’s a reason the Steam Deck opted to use KDE and not Gnome.
KDE is an absolute mess and is a hobbyist DE in comparison to the professional GNOME.
As someone who used gnome for two years, hell no. Gnome is trying too hard to be minimalist and is lacking basic features that you have to use extensions for. Extensions which, by the way, break each update and have their own bugs. I also had to use gnome tweaks for basic crap like disabling mouse acceleration. KDE is a much more polished experience for people who actually use computers, but gnome is okay if you’re just looking for something simple that looks smooth.