How to decide between subglandular and subfascial plane?

These are different techniques and the one who should make the decision is your surgeon based on the clinical examination and your body. The subfascial plane is not for everyone since the fascia can be very thin and flimsy in some people and you won't know until the surgeon is working on it. Subglandular plane has the most complications long term.

Dear ggreguer77664,I almost always place implants submuscular. It lowers the rate of capsular contracture significantly. In addition, it looks much more natural because the muscle provides covering over the implant so its not as round on the top. I've also noticed the implants drop less over time when they are protected under the muscle.
Daniel Barrett, MDCertified, American Board of Plastic SurgeryMember, American Society of Plastic SurgeryMember, American Society of Aesthetic Plastic Surgery

In my practice the majority of patients select to have their implants placed beneath the muscle. There are some great benefits to this choice. The muscle does provide a bit of camouflage for the upper portion of the implant, concealing the edges and rippling/wrinkling. This is particularly helpful for those with thin itissue. It also carries a lower incidence of capsular contracture. Patients also often prefer it as they feel it provides a more natural look.