well, both parties are right. You use the Isosceles everytime you have the chance, specially on high caliber handguns since it will give you more accuracy. Now, if you are on a dynamic gunfight where you have to move, the best way is one handed and offering the less target surface, which means you can't face fire gun with all your body exposed like on isosceles or chapman or weaver unless you like your body with a lot more plumb and a lot less fluids. Basically, to use the 2 hands you need to be in a position where a) you aren't being fired b) you're shooting from behind 3/4 of your body protected, like a car c) you're fully protected, and you jump at the side to shoot and get back to protection d) you're prone shooting
I think those saying the way to properly shoot is using two hands stands are polygon shooters, which make sense. But armed and security forces have to face a lot of situations where 2 hands shooting is simply impossible, anyone who was in the army knows this.
btw, the gangsta drug dealers example is really funny. Not to mention the Olympics example
