This +1
I can't think of a self defense situation where you would pull a knife over a pistol. A knife is only a good choice when no pistol is available and a pistol is only a good choice when no long gun is available. Carry what you like and don't overthink it. :thumbup:
It's not a matter of pulling a knife INSTEAD of a pistol, it's a matter of having options for different situations.
Imagine if you drew your gun and your attacker struck your gun, hand, or wrist with their weapon, causing you to lose your grip on your gun, possibly sending it flying away. Imagine if you were tackled as you draw your gun, and your gun goes flying, either at the moment of being tackled or after you hit the ground. I could go on and on.
Also, most people carry their gun in such a way that it is only quickly and easily accessible with one hand, imagine if that hand or arm is injured during the attack before you are able to draw your gun.
Are you confident in the security of your holster? Do you even use a holster? Agin, imagine you are tackled and the gun gets knocked loose from your holster or drops out of your pocket.
Imagine if you are attacked by surprise (like any smart predator will do) and you are struck or tackled from behind. Now you are on the ground, head spinning, your attacker is punching, kicking, stomping, or choking you out, do you think that you will be able to draw your handgun and effectively shoot an attacker who might be BEHIND you (choking you out in a headlock)? In such a situation, pulling a fixed-blade and stabbing at whatever part of your attackers body you can get at can be a very effective way of making him stop.
If a person assume that an attacker will announce his presence in advance, giving you plenty of time to draw your gun, and if a person believes that every self-defense situation will be a stand-up, face-to-face encounter, then they really don't understand self-defense. If a person believes that arming oneself with a gun is a garunteed way to survive an attack, then they neither understand self-defense nor close-quarters shooting.
People who are serious about self-defense recognize that the more options you have with you, the more situations you will be prepared for.
I was going to comment on neck knives, but others have already said it. I will say, a fight can be VERY physical, lots of movement, lots of violent thrashing, falling to the ground, possibly being tackled, I don't imagine that a knife worn around the neck like a necklace is going to stay in place and be quickly or reliably accessible..