Have you watched a lot of krav maga? I'm not a krav guy myself, but literally every demo of krav I've ever seen has heavily emphasized weapon disarms. Gun mostly. Whether those disarms and demos were credible depends on the case. But the idea that krav doesn't address weapon disarming is, frankly, flat out wrong. As for the actual question, as always it depends on the schools involved. Well taught hisardut would be better than badly taught kajukenbo.