I live in Florida and have enough of a belly that a Glock is either too uncomfortable or not enough well-concealed for me. I’ve tried a lot of handguns for concealed carry over the last 17 years and always come back to the good old J-frame S&W. It’s comfortable, easy to hide, easy to use. I admit that it doesn’t carry the ammo for a long gunfight, but the 5 shots should be enough to get away. Just to be safe, I carry 6 spare rounds in a Bianchi Speed Strip. Again, it’s easy to hide, but lacks some tactical advantage due to it being a little slower to deploy than a speedloader or spare magazine.
If I was going into a really bad situation, I would likely carry the Glock or Beretta 92D in a variety of non-gun containers, such as a zippered Day Planner, netbook case, or messenger bag.
I’ve had to use my concealed weapon twice and both times I was fortunate enough that just showing that I’m armed was enough to end the encounter.
I do agree with you that if I was going to carry a concealed semi-auto, it would be a medium-frame Glock in an IWB, but I tend to carry behind the hipbone.
My private evaluation always comes up with a double action revolver of a suitable calibre.