a big complaint of men's BC on women is the fact that the straps comes down to the front like suspenders, instead of toward the rear like backpacks. Even when trying a suspender type in the shop might not feel uncomfortable, when loaded up with tank and weights, they could start squeezing you in the wrong places. Also, the sternum strap should right higher up so as not to have to pull the place where it attach to the shoulder straps toward each other, which also causes discomfort.
Since women have a shorter torso, the cummerbund/waist strap has to run a bit higher than men's. This might cause the BC ride a little higher than on a man (could cause the bladder to ride higher or start wrapping over the shoulder), thus some brands has torso length adjustment that's independent of the front strap adjustment. Also, with the higher cummerbund, the pockets attached to it will be a bit higher, making it harder to reach. Some women's BC has pockets that attaches below the cummerbund. Or even have cummerbund that contours out toward the bottom, etc.