I wear women's BCDs so don't have personal experience with any of these specific models. However, I very happily wear a SeaQuest/Aqualung BCD for teaching that is women's back inflate, quite similar to the Balance. Back inflates are a nice compromise between a wing and a standard jacket, I find. (I own several bp/wing combos, and a several styles of jacket.)
When I counsel my divers on gear purchases, one thing I always encourage them to think about is how widely the gear is distributed. Aqualung is a big world brand, as is ScubaPro. This is important because if you are traveling and have any issues at all, you need to be able to find dealers and repair techs. If you never stray far from home, it's not as much an issue. The Aeris is not as widespread as the other two, so if you have an inflator hose thing or any other problem, it's very hard to find repair facilities outside North America, and where they exist, there are few of them (none in Thailand, for example). Just as an example, I recently had a diver lose a weight pouch from an Aeris BCD and there was no way to replace it here.
I agree with NetDoc's recommendation to add a tank to the BCD when you are trying it on. It's also very useful to get in the pool with it, if the LDS uses the same brands for rentals as for sales. I just had a tall, skinny guy with rather broad shoulders as a student. He seemed to me to be a ScubaPro size L by looking at his torso, but even tightening the cumberbund with the clips in the back he was uncomfortable in the pool because the BCD danced around his middle too much, so we traded down to a size M. It looked a bit small just eyeballing it, given the width of his shoulders, but he was hugely happier in the water. Maybe ScubaPro isn't the best brand for him, but that's not the point... we really didn't know what would make him comfortable/uncomfortable until he was in the water with a tank on. He'll be back in July for more training, so I'll see if he's even happier in a bp/w. Up to him. That gear configuration isn't necessarily right for everybody, but it might be best for him.