Generally, speaking, low profile implants create the most natural appearance. Not all patients want a natural appearance, and some women prefer extremely projected breast that look more like tennis balls on the chest. from my experience, I choose implants based on the correct diameter that fits in the breast pocket. From there on, I select higher profile implants for patients who want more volume in their augmentation. If I can get away with a lower profile implant, then I will generally lean in that direction. I increase the profile when patients have a small diameter breast and want aggressive augmentation.