Body type and holster make a difference. I have an athletic build, and I've found that I conceal the P10F better than I could the P10S. The reason being is that it's the very end of the grip/magazine that typically prints through the shirt, as it's those corners that the shirt gets caught up on. So, with the longer F grip, those corners hit me further to my side when I'm carrying AIWB, so it's less noticeable. The S would print closer to my stomach, and be more noticeable. Using a dark wing and a teardrop muzzle pad, both from Darkstar, were game changers for me. They push the grip so snug against my body, that it's actually even more comfortable to carry the F due to where those corners hit me (hot spots). My body type also helps, I suppose.