This is just one point of reference, My wife and I just took a CCW class with 12 students, it was not done through a gun shop, so it was everyone bring your own gun, so no deal of the day guns were seen. We were divided up into groups of 6 for the shooting so I am not exactly sure who had what, there were 3 women and 9 men. I don't recall exactly what everyone had, we had an XD-9 SC and and XDM-9, there was also a full size XD-9 there that belonged one of the insturctors, and an XD-40 belonging to one of the students. The only other close matches were a pair of Ruger semi-autos, I am not sure of the model, but they were both 9mm and both looked similar, but were not identical. There was only 1 revolver in the group, a small frame 38 (Not S&W J frame, but something styled similar to it), 9mm was by far the most common caliber, but we did have a couple of .380's, one a Bersa, and the other an older nickel plated pocket gun of some type (screamed cheap junk from 20 years ago, whatever it was had no slide lock which was no end of problems with the must be open when gun was down rule ) being used by a woman that had never shot before. So out of this new group of people getting their permits there were no clear winners, with all / most of the major brands represented, mostly in Poly frame 9mm semi-autos which ranged from a S&W Sigma to a Glock on the high end.