The NOX case would get my vote over the Z11 plus honestly as far as aesthetics go. As far as overall options the Z11 wins, especially in the cable management department.
If you want a better looking case outside, the NOX wins, and if you want a tidy setup inside, the Z11 wins.
Honestly I like the NOX case better for the looks, but the Z11 is most likely the better case overall. I'd say the z11 wins over the NOX, so you should go with that.