I’m going with Modified Weaver - that is a personal thing though. I think training isosceles is fine, and since it’s the format for USCCA training, it’s what I’ll teach for the USCCA certified classes - you have to start with a single choice and work from there, so Isosceles it is.
Here’s why weaver for me though:
- The vast majority of my firearms experience is shotgun. there’s no Isosceles in shotgun. This is where my training is founded, so it’s very drilled in, very automatic
- I also have martial arts training background, and that step back to make space and add stability thing is drilled in from that as well
- Two of the sports I spent quite a bit of time in are cross country skiing - which uses that one-foot-back to create certain kinds of control - and snowboarding - which has one forward one back built into the board and held in place with bindings.
- I have knee issues. In my case that means standing feet parallel makes me very vulnerable to being tipped forwards/backwards off my feet - I can’t compensate in the forward/backwards adjustment because my knees can fail in that direction. My right/left stability is much better. The solution for me is to create that isometric structure vertically with one foot forward, one back, and a shoulder width right-to-left. I don’t stand feet parallel for the most part, even if I have a wall to lean against… the instinctive fear of falling has me offset my feet forward/back, even if only a few inches are convenient.
All that said, I don’t disagree that in a sudden-loud-noise situation, most people, including me, will probably drop their body center (crouch) right where they are. I don’t think people square up their feet to accomplish that, but I do think if they’re square already, that’s what’s happening.
I think reduction of shoot-able mass provided by Weaver makes good sense (unless you’re wearing plates, in which case you’re exposing your un-plated side. But then who walks around wearing plates?)
I suspect the reality of many situations means you will be shooting from whatever position you find yourself in as adjusting your position will be a much lower priority than addressing the threat and, if needed, drawing and shooting. In the real situation, I doubt I’ll be giving any thought to position and posture, but my body will instinctively do what is needed to not be in precarious danger of falling down.
I also think that for the same reason we train shooting weak hand and single hand on the strong side, we should train weaver, modified weaver, isosceles, from the cover of a building corner (both left and right, standing and kneeling), behind low cover (like a car), standing on a steep slope (left/right/forward/back), laying on one’s back or any other thing one can think of. If I had to be shooting left hand from behind a covering corner I wouldn’t want the time my life depended on it to be the first time I’d ever done it.
So for stance, I’m going with isosceles as my USCCA entrypoint for training people, but training myself from a variety of stances, and my most common choice will likely be some variation on weaver.