I find that a "sub-6", or "line-of-white" works best for me. I have trouble seeing the front sight against the aiming black, so in sitting and prone I let the front sight come up into the black, then lower it until I just resolve a little bit of white, then take the shot.
The human eye can resolve approximately 1 MOA, so when my eye picks up the little bit of white my sight is pointed just about 1 MOA below the aiming black. But consistency is the key. As long as you are consistent your POI will be the same each time (if you do your job). Then it's just a matter of adjusting the sights to put the POI in the center.
This technique works out good for me in offhand. I never could get a nice tight wobble area in the black. Heck, all I can see is a little tiny blurry baby aspirin out there! Like most folks, I would stand there and watch my front sight wobble all over the target until my eyeballs sweat. No more! When the target comes up I mount the rifle and take a breath, letting the sight drop down below the target as I exhale forcefully so as to check my number board. Don't want to put rounds on my neighbor's target. Then as I inhale I let the sight climb up through the target frame. I then let the breath out normally to my respiratory pause. I watch the sight start down through the target frame, correcting windage as it passes through the top of the frame, and let it continue to sink down through the black, refining the windage as it does so. Then, when it drops out of the black and my eye sees that little flash of white, I send it!