OpenSUSE, Tumbleweed on the dev box and Leap 15.1 on the cluster, all KDE. (The laptop and iMac run OS/X, of course.)
I had Centos on some of the cluster nodes, but having a couple different distros was annoying for no particular benefit, so I changed it.
I generally run newer kernels though. I think I have 5.0.20 everywhere at the moment. (Gotta be careful with the one node with a weird GT120 video card, the nouveau people manage to break it every now and then, although it hasn't happened for a while now.)