I did a search and had not seen a discussion of this per se.
I am aware of three different sight pictures or holds when shooting, especially distances of 15 yards or greater.
1. Six O'clock hold, equal height, equal light, but holding a portion of the target above the front sight. In other words, tip of sight at the 6:00 position.
2. Equal height, equal light, bisect the target with the top of the front sight expecting bullet impact at the top center of front sight.
3. "Drive the Dot:" I assume this means equal height, equal light, but the Dot on the front sight is placed over the top of the desired impact point. I guess this could also be called a twelve O'Clock hold.
I don't know what I don't know about the relative advantages or disadvantages of the various sight pictures. I assume they each had/have a purpose. I have always used the #2 sight picture as it made the most sense to me. I assume the #1 picture would come into its own as distances really increase and one wants to increase holdover without obscuring the target with the front sight. I have no idea how far away that would have to be. I also expect the #3 would be best for up close, faster shooting.
I wondered if the more historically knowledgeable folks would care to weigh in on the pros and cons of each of the pictures. I would also like input on which the forum feels is best for defensive pistol use.
In searching for an image to accompany this post, I found the above image in this blog post by ToddG. I found the reading helpful.
http://pistol-training.com/archives/1361