Been using Gnome for the past 4 years at least, but I decided to switch to KDE after trying it again. I seem to recall that KDE wasn't stable enough. I must have tried it when v3 was having stability problems, and then v4 was in between as well. Lately, I switched to the latest that comes with Ubuntu 13.04 and I like it more. It get more tweaking, and it's pretty stable.
Gnome has become too minimalistic to my taste, although I like the approach, but too much tweaking was needed to customize it to my taste.
I also like digiKam application, it's way better than shotwell. It's got a two pane comparison window when editing images, that is an excellent feature. I do feel that shotwell is faster a bit, but I can live with the slowness for those options.