We've been down this road before...
Ed McGivern (the fastest shot in the world, for generations) said he used DA revolvers because he was faster with them than with autos. And I believe him.
This is not to say that even an exceptional human is faster than the cycling of an auto pistol, they are not. But there is more than just the speed of cycling involved. Its things like trigger reset, and feel as well. Once the slide closes, the trigger group has to move enough to reset, and the shooter has to time the release and next pull differently than on a DA revolver. The top speed shooters are not faster than the auto is mechanically, but they are faster than the auto is functionally, compared with a tuned DA revolver, in their hands.
As to the 50 year thing, I would choose the revolver, not because of concern about the magazine spring (there have been many examples of modern mag springs being left loaded for decades and working fine), but because of the other moving parts, notably the slide.
A few years ago, my father passed away. While going through his things, I found his 1911, loaded in a drawer. It had been probably 6-10 years since it had been touched, perhaps more. When I cleared the gun, the slide only closed about 3/4 of the way, due to the oil having thickened, turning to sludge. The loaded magazine worked perfectly when tested later.
SO, I would choose the revolver, because, even if the oil had congealed, as long as I could still pull the trigger through DA, I believe it would work. And if it worked the first time, it would work the 2nd, 3rd, 4th, 5th, and 6th!