Same surgeon, same technique, same attention to precision and detail: perhaps a small amount less pain and muscle spasm above the muscle as compared to below. But the variation among surgeons (blunt vs. sharp dissection, precise hemostasis vs. less fastidious with more bleeding/bruising, and other factors such as use of long-acting anesthetics in the pocket, muscle relaxants, anti-inflammatory medications, or NOT) is much more of a determinant of post-op pain rather than choice of implant position above or below the muscle. You should choose the best surgeon, not a particular implant position!
But as Dr. Johnson has indicated, there is clear-cut scientific basis for less capsular contracture below the muscle as compared to above-muscle implant placement, so you should consider how much "pain" (financial, time off, and actual surgical discomfort) is associated with re-operation for capsular contracture!
You want the most careful and precise surgery in the best implant location for reducing risks, and then use the most thoughtful and comprehensive pain/spasm/inflammation protocol during your recovery. Also, no dancing or clubbing after surgery, even if you feel so good you can! For more information, click on the web reference link below. Best wishes! Dr. Tholen