Which is better?

Mounting the scope (with brackets) directly to the firearm, not allowing for the use of iron sights, or mounting the scope on see-thru brackets, allowing for the use of iron sights.

I've notice that even though I have see-thru mounts, I've never used the iron sights on my Rem 700 BDL. I'm looking for more accuracy, and was wondering if lowering the scope might help with my posture and setup?