Thank you for the clarification, I appreciate it!
I am going to tell you why I voted for KDE. First and foremost what attracted me to it, was simply how stunningly beautiful it looks. Like seriously! How many OS's can you say look that good straight out of the box?
KDE is based off of XFCE correct? So that means added to its beauty out of the box, its also highly customisable. Basically, if I wanted to install any of your themes, I'd probably have a 100% guarantee that they would install and work right out of the box too!
Because on the other side of the coin, Gnome is much more restrictive in theaming. It doesn't mean it can't be done, obviously, I've been doing it, two machines now with Gnome! But it means unless the code is 100% correct, a Gnome DE will die.
So more to point that Aravisian always makes and tries to instruct people, is that XFCE is more customisable. Now onto performance. I've never tested it personally, I am only going off of what I have seen.
But when you look at video's of KDE on Youtube, IDK man, it sure looks like a smooth experience to me. I don't remember seeing weird stutters, lock ups, frame rate drops, crashes. It runs smooth.
So anyways, thats why I voted KDE, I think it might be the best choice for Zorin.