What's your preference when you have a red dot with fixed iron sights...

... Co-Witness or 1/3 Co-Witness?

I'm setting up a new upper with a red dot and already have some fixed sights in the parts boxes. I think I'm leaning towards the 1/3 Co-Witness set-up as the irons seem to make the sight picture too busy.

I'm only asking for other input since I've never run an RD with irons, so am curious as to what those of you who have the experience have gone with, and why.