I have both 9 and 40. The British SAS used the Browning Hi-Power in 9mm for years as their primary handgun. Reason why I bought it. Single action only, basic design, will run forever. I now have a H&K USP compact in .40 cal. with a de-cocking lever. I have retired the 9 from carry purposes.

Why? I like the 40 better from a shooting standpoint. Yes it carries more punch, but that was secondary. Shot placement is the most important factor in any gun fight. My shot placement with the 40 is better than with the 9. End of story.

My advice, go to a range that will rent guns and try a bunch. See what feels good to shoot and that you can shoot accurately. Then find a gun shop that will let you try on a couple of different holsters with the gun in it. See what feels comfortable to wear. Look carefully at what you typically wear and see how it conceals. I changed my regular jacket and now my paddle holster only just fits. A smaller gun would allow me more options. I know people who swear by little Kahr K9s because they are real easy to conceal and shoot well.

Finally, no matter what, get out and shoot a lot. Shoot from concealment. Take a class, but just shoot.

Regards,
Bill