I'm new here but not new to guns and this looks like a great thread to jump into. LOL
First of all, thanks to the OP for doing the video. In a lifetime of carrying firearms I had never really considered the advantage of a covered hammer for shooting out of a pocket. And to be honest although I have an ancient Charter Arms Undercover, and I know there are hammerless models I didn't know they made snubbies where you could also access the hammer.
I can envision situations where a surprise move like shooting right through the pocket could be advantageous, and an auto very likely would get caught in the material.
However, 18 rounds of 9mm beats 5 rounds of .38 no matter how fast you can reload!