With KDE I have the feeling that it's kind of "full". I have always been able to customize Gnome in whatever way I've needed, but that's less in-your-face than in KDE.
It's also a matter of what I've gotten used to. I started using desktop Linux with Redhat 5.2, and that came with Gnome. So, I got used to it, and KDE is different. And of course, KDE might have changed in the last 10-ish years, which, I think, is how long time ago I touched a KDE desktop at all.
But, since I'm happy with GNOME – and, this might sound scary – actually even happier with Unity that I'm using now, I don't really have any need to venture to try anything else.

It works for me and switching to something else would require at least some amount of effort.
I'm already being less active with my children than I would like to, so I don't like putting any effort into things that won't really bring something useful for me or others. I prefer spending that effort for being a better father :)