It’s hard to say without a photo which placement fits you the best. There are various factors regarding how you want your breasts to look and feel, but if you and your doctor have a good, open line of communication, you shouldn’t need to go back and forth on your decision. A major factor that effects how breast implants look and feel is whether they're inserted over or under the chest (pectoral) muscle. I do submammary and submuscular implants, inserting the implants under the breast tissue and over the muscle through an incision in the breast fold. The result is fabulous: perkiness with barely a trace of scar.
If you want the most natural-looking breast you'll need a subpectoral implant, in which the implant is placed under the muscle. This procedure also requires the merest incision - about three centimeters in the crease under the breast or at the edge of the nipple -- and diminishes the incidence of capsular contracture, the formation of hard scar tissue around the implant which occurs in 10 to 30 percent of cases.
Subpectoral implants aren't right for everyone, though. If you have saggy breasts, an implant placed under the muscle won't fill out that empty breast sack, and you'll get what we call the "double bubble" look, where the implant is situated next to your armpit and the breast hangs several inches below it. Instead, you can have a procedure called augmentation mastopexy, in which the implant is placed under the muscle and the skin on the breast is lifted and tightened.
In short, you must know -- realistically -- what you are starting with, as well as what you want to look like when surgery is done. Do you want a natural appearance or a round, perky look? These are some of the factors I weigh with my patients when evaluating what type of procedure to do.