[m21sniper]

I prefer weaver because it protects your nuts from a kick at close range, because it allows isometric pressure to be applied to achieve a more secure and stable grip, and because it is a very easy stance to punch/pistol whip or kick out of, as after all, it is essentially a basic boxing or martial arts stance (Bow in Kung Fu)

However isosceles has the advantage against multiple targets over a wide arc, due to the inherent turret effect of that stance. But it leaves you very vulnerable to physical attack and it is not as stable (ie accurate) for precise engagements.

Both have pluses and minuses.

Kneeling is great whenever you can do it. If you can draw and get right into a kneel you make yourself a much smaller (and initially moving) target, and it is an extremely stable shooting position.

Prone has a definite place too. Even supine.

They all do.

Whenever i teach a new shooter for the first time i always teach them weaver.