We need to remember that the FBI and their protocol choose the 10mm as the ultimate fight stopper too. I don't think street results have proven it to be any better than anything else and after spending money on R&D and shiney new guns.
FBI is heavily weighted toward penetration and maybe rightly so for general LEO duty.
I don't know of anything that works 100%, I carry a .380 and 32acp because it can be in a pocket when I wouldn't have anything else or used when everthing else has failed. If needed I don't think I'll be concerned with how far it penetrates in gel.
