A Very interesting question.
Subglandular and submuscular pockets both have their upsides and downsides. A submuscular pocket is very rarely completely submuscular.
Here are the pros and cons.
1) A subglandular has a higher rate of infection, contracture, wrinkling and bottoming out in the future.
2) A subglandular pocket is less traumatic, so there is less pain in the first few weeks. There is also little risk of animation deformity (implant moving when the chest muscle is flexed).
3) A submuscular pocket has a lower rate of infection, contracture (hardening) and wrinkling.
4) A submuscular pocket has a risk of muscle animation and a strong chest muscle can push the implants towards the arm pits.
5) In the United States, >90% of plastic surgeons use a submuscular pocket.
Looking at your photos, a subglandular pocket might prevent a snoopy deformity, but this comes with a risk of bottoming out over time. You do have some excess/loose skin below your areola. Another option might be a submuscular pocket with a tightening procedure to tighten the skin under the areola and prevent a snoopy deformity.
You have several options, so continue gathering your information in order to make an informed decision.
Good Luck!