Everything on the gear sling. Runners, rock pro, and screws (I climb on BD screws if that changes anything?). Only knife, v thread material and anchor material on my harness.
It seems like a cluster first couple times you try it but with some practice while ice cragging and you get used to it. I found screws in the front, then rock gear and finally draws in the back kept things fairly untangled.
For ice leads at my limit I will for sure rack everything on my harness neatly but most of the time in the alpine I'm on terrain that is below that upper limit... because of that I can spend a few extra seconds fumbling with the gear sling for each piece of pro but doing so saves me minutes at the changeovers.