Regarding Miculek, he's in a nice video recently put out by iraqveteran on youtube. In it, as I recall, he uses something closer to picture #2, though he basically says that his thumbs serve no function and if anything only get in the way. He also doesn't use the index finger over the guard, and I believe I recently saw a video of Hickock45 on gripping where his singular firm piece of advice was not to place the finger on the finger guard front aspect. Hickock is still using the Weaver stance though. Both those videos are worth watching for tips.
Personally, I having done #1 early on, I did find my accuracy improve with grip number two, and I was surprised because it doesn't seem like you have as firm a grip on the gun. I will still sometime use the index finger on the trigger guard front aspect of my subcompact Kahr CW380, since it's easy to do, and since the gun begs for more grip on it with it being so darned tiny (and mildly snappy). Great shooting gun though once reliability is established.
Hickock is also unusual in that he never uses his pinky to grip the gun firmly, which is fine for subcompacts I think, but maybe not as useful for bigger guns. The best leverage against flip is in the lower aspect of the grip, so why not grip extra firmly there? You should I think (while still keeping the grip overall as high and close to the bore axis as possible.)
The other piece of advice from Miculek was to make sure your trigger finger has only one task, to pull the trigger, and not to drive the gun as he says, which can unconsciously happen, even for him occasionally he said.
Personally, I having done #1 early on, I did find my accuracy improve with grip number two, and I was surprised because it doesn't seem like you have as firm a grip on the gun. I will still sometime use the index finger on the trigger guard front aspect of my subcompact Kahr CW380, since it's easy to do, and since the gun begs for more grip on it with it being so darned tiny (and mildly snappy). Great shooting gun though once reliability is established.
Hickock is also unusual in that he never uses his pinky to grip the gun firmly, which is fine for subcompacts I think, but maybe not as useful for bigger guns. The best leverage against flip is in the lower aspect of the grip, so why not grip extra firmly there? You should I think (while still keeping the grip overall as high and close to the bore axis as possible.)
The other piece of advice from Miculek was to make sure your trigger finger has only one task, to pull the trigger, and not to drive the gun as he says, which can unconsciously happen, even for him occasionally he said.