The S&W "K" frame 3" Model 13, 64, 65 and 66 revolvers just MAY be the best personal defense revolvers ever made.
Some reasons:
The 3" barrel offers a longer sight radius, slightly increased velocity, better "pointing", and a full-stroke ejection rod for positive ejection.
The gun is the "perfect" size.
Other snubby revolvers are too small for a quick, good shooting grip, and usually hold only 5 rounds. (The Colt Detective Special is the exception).
Bigger guns are TOO big and don't conceal well.
Since the "K frame is heavier and with larger grips, you can shoot faster and more accurately than with a smaller gun that recoils more and is harder to hold on to.
The action can be "tuned" to a smooth pull that enhances accurate shooting. Other guns are usually coil spring actions that aren't as smooth.
Sights are near perfect in size and design.
The "K" frame is very strong, and if shot with .38 Special ammo, will last about forever. Smaller guns wear faster.
This means you can practice with lots of ammo without fear of the gun wearing and needing service.
In stainless steel, the gun won't rust like blued guns, which is a big bonus on a concealed carry gun.
Unlike autos, the "K" frame doesn't need as much maintenance.
The KISS principle.
The S&W "K" frame is as simple as it gets. There are no buttons, switches, or safeties to confuse things. As such, it's a "Pull, Point, Shoot" gun.
Absolute safety.
The "K" frame has been around for over 100 years. Any bugs have been discovered and eliminated long ago.
There is only ONE way to get the gun to fire, and that's to pull the trigger.
Due to the above, MOST people are able to shoot much better with a 3" "K" frame than with any other small revolver, and many autos.
With one of the 3" S&W "K" frame revolvers, you are as well armed as it's possible to be. Unlike smaller guns, there is no feeling that you're under-armed, or doubts about reliability.
With proper ammo, there are no doubts about stopping power.
Taking all this into consideration, the 3" "K" frame is one of the most comforting guns to carry.
Over the years, I carried just about everything available.
With the small autos I always had questions in the back of my mind about stopping someone, and/or reliability. There was always the doubt about "would it stop a Bad Guy, and would it jam when I needed it most?"
With bigger guns, there was the weight and conceal-ability issues.
A big, heavy gun tends to get left at home sooner or later, especially if it requires a hard to put on holster system.
With autos, there was always that lingering question about reliability.
With my older 3" Model 66 I have no concerns about any of this.
I know if I have to use it, it's GOING to be FAST into action, it's GOING to fire, I'm GOING to hit the target, and it's GOING to hit the Bad Guy HARD.
It doesn't get any better.