Install them both and try. 🤷♂️
Linux
Shit, just linux.
Use this community for anything related to linux for now, if it gets too huge maybe there will be some sort of meme/gaming/shitpost spinoff. Currently though… go nuts
I don't know if it was ever true that one was more customizable than the other. Maybe back in the early days of GNOME Shell or GNOME 2 you could say KDE was more customizable but right now it doesn't matter. KDE has like 451 million options ootb while GNOME has approximately 451 million extensions so it really boils down to which one you like more.
KDE is the correct answer. I guess you could also learn coding, and then any piece of open-source software would become "customizable" to you...
For me the main difference is that KDE wants to be customized, whereas GNOME does not. You can theme gnome, but they don't like it and will not make it easy. As for css customizations, I themed some gtk (not gnome) apps and really don't want to do it again. The css is some weird flavor that doesn't support half of css features and you can't edit the "html" so targeting some elements is really difficult.
I wonder how Hyprland fares for overall customization