An informative article - An Alternate Look at Handgun Stopping Power - provides both his results/opinions, and how he got the results. The methodology is often omitted by other researchers, which hinders a thinking person's ability to analyze the data.
I realize firearms are a controversial subject (particularly on firearm/martial arts forums), but feel people looking into realistic self protection measures should be open minded and desire to learn more about all aspects of personal protection.

What's the best gun to have in a gunfight? The one you brought.