Here is some information that is relevant...

Here is some information that is relevant https://www.soundstagesolo.com/index.php/features/258-balanced-armatures-why-you-might-or-might-not-want-them. One important aspect is that Knowles( Andy is the marketing guy for them) invented the balanced armature so the company is based on that. They cannot move as much air with a balanced armature so you get less low-frequency sound. This is important when you have an open fit headset as feed-forward ANC needs to be. The armature is smaller in size and that is why they are usually used in hearing aids.