I have ridden both the Aero & the Atola. There are differences between the 2 models.

cut-out -- bigger on the Aero model.

shape -- Atola is considerably shorter overall than the Aero, so if you sit more towards the front of the saddle, you might run out of saddle to sit on.

weight -- Atola is lighter.

It comes down to a matter of personal preference. I can ride either one, but after a lot of road & trainer testing over many months my choice between the 2 would be the Aero. The Aero is a better shape for me, the way it curves in towards the nose. The Atola curves out & starts to bug me on really long rides. Also, the sit-bone support seems to be just a little too far apart for me on the Atola (I am very narrow in the hips). So I am more comfortable overall for longer on the Aero. But other women riders I have met on long rides prefer the Atola, it fits them just right. So if possible, try both. And if you really like the Atola for fit, but it seems too short, it is available in a men's version (same saddle, just longer), called the Arami.