Revolvers; don't take two hands to cock, never jam.
The claims that revolvers are outdated or obsolete are simply nonsense. Revolvers are typically more accurate and they allow for the use of specialty ammo. Jamming is so rare as to be a non-factor. If the ammo fails in a semi-auto, there are actions to be taken. But they involve both hands and you must take the gun down so you are not sighting down the barrel. With a revolver, you simply pull the trigger again. At most you cock the hammer and pull the trigger again.
Also, with semi autos there is some debate on the safety of having a round in the chamber. A loaded revolver is ready to go. No manual safety involved. And modern revolvers, like Ruger, are safer to carry due to their transfer bar system. Drop it on the hammer and the gun still won't fire.