Both have their uses, as for me, I try for erect and mobile!
Myself training the need for a shooting stance to shoot will get you killed in most CCers needs in the real world of gunfighting. Most gunfights happen inside 10yds and most of them will be inside 3yds. So see what you need to see get the gun on target the fastest way you can and get hits before the BG does.
Yes if you have time and distance needing stance, sight picture, trigger press and all then yes but most fight will not allow that time or distance. One will fight the way they train. Target shooting will get you killed in real life most times.
I prefer the isosceles If the threat is always straight out in front of me, which it's not. Consistency is easier to achieve IMHO, this way. Driving the gun straight out to a mechanical lock, a natural stopping point. With the weaver, unless you get the angle exact every time, harder to be consistent. I would like to see his knees bent a little more, weight forward a little more. You are better off practicing drawing from every ackward position you can think of, 360. off axis, on your back, on your sides, etc, imagine it and practice it. The threat is not always out in front of you.
In a gunfight the target is not always where you want it to be if you need to shoot from a certain stance position. Meaning you have to move your feet before you can start the draw, taking time you don't have in a gunfight for you life.
You see the treat, you see the target, just get it done. See what you need to see to get the hits you need to stop the fight the quickest way you can get the job done.
I train to shoot in front, to the side (both sides) and to the rear. Am I covering my body at time with the muzzle? Yes, but my finger is not on the trigger. Training of the trigger finger is one of if not the most important things about shooting a gun. IMO
When shooting for "pleasure" (Punching holes in paper), I might use a particular modified stance. I do agree, NEW shooters should LEARN the fundamentals, BEFORE adjusting to situations. When training (defensive pistol), I am moving and NOT concentrating on stance fundamentals... JMO
I'm no expert (as my next comment will probably reveal), but I've been taught by police officers that under duress (which is where most civilian gun owners will find themselves) people will assume a "squared up" stance with hands in front as a natural defensive position. I'm assuming we're talking about defense and not target shooting. So when at the range, I practice only from this "natural" position, or that position in a slight crouch.
18 seconds into you first video you talk about "presenting the handgun from a modified Weaver Stance". IMHO, you don't present a defensive handgun "from a stance". You establish your stance while your handgun is being presented. Much like a street fight, that luxury of time, space & circumstances often simply doesn't allow careful foot placement BEFORE the threat appears. Only...during.
I see a lot of great points here. I generally use a modified Weaver stance, but when I practice my CQB techniques, I am usually in constant motion while moving around obstacles and acquiring targets. The only proper stance is the ability to adapt to the requirement of any stance. Anybody else practice drawing and firing while falling? I believe this is a vital skill. Anyone can be surprised by being pushed over buy an assailant. So it can be useful to get this down well.
When I started shooting I was really concerned with stance. Trying to be perfect with both the isosceles and weaver. When I watched hickok45s grip and stance videos, I tried shooting like him and got much better. I'm not saying it's right for everyone or that its the best way to shoot, but it did me a lot of good. He also does this weird thing with his support thumb(think because he shot revolvers for so long early on) and my sight picture was so much more steady. I just think everyone finds their own variation naturally without even realizing it.