Hard to answer this question when considering the practicalities of the real world ... especially when you have to factor in more than just the firearm. It's not functioning in a vacuum, so to speak, or isolated from the rest of the world.
Notwithstanding the quality and inherent mechanical limitations of any pistol, other factors which may affect functioning include the ammunition used, the shooter, maintenance and the environment in which its being used.
As a LE firearms instructor I've seen a fair variety of firearms. (Which doesn't count that I started learning to shoot about 49 years ago.) I've observed them being used by other folks, and then I've personally handled and fired a fair number of them myself.
As a factory trained & certified LE armorer for a few manufacturer's products I've listened to the armorer instructors (and factory techs) discuss potential problems that may occur with various pistols, as well as how to inspect and identify the probable cause(s) and correct problems. I have yet to hear a firearms manufacturer say that their product will never experience a problem in the hands of a LE user ...
I've owned and used a number of examples of specific makes/models/calibers of pistols which have yet to exhibit functioning issues in my hands, and then I've experienced the occasional functioning problem with a different example of the same make/model/caliber. Watched some other folks do the same thing. Listened carefully to other experienced armorers, as well as factory folks and gunsmiths, when they described their own experiences, as well.
When I had the chance to talk to another armorer who had returned from serving overseas, the subject of firearms functioning in an extreme environment (fine sand) naturally came up, and I asked about his experiences. He was willing to discuss his experiences regarding carrying/using 4 different models of pistols produced by 3 of the major manufacturers while serving over there. All but one of them were adversely affected by the sand and experienced functioning issues. A couple of them experienced problems within a day of being carried and used. Doesn't really matter which makes/models/calibers were involved, though, since it might be possible to take a different set of examples of the same makes/models, and have a different set of results experienced in the same conditions in the hands of the same, or a different, person. Sand is a harsh environment, and it might be reasonable to conjecture that frequent maintenance is critical in such harsh and extreme environments.
BTW, don't bother asking what the makes/models were, since I no lomger have much desire or interest when it comes to listening to some folks start passionately defending their favorite pistols as if they were personally insulted by someone else's experiences. While I only met the fellow during an armorer's class, I have no particular reason to feel inclined to disbelieve his claimed experiences. He didn't really seem to be holding out that any particular make/model was better than another, even the one pistol which didn't exhibit any sand-related issues, and he actually seemed a bit surprised to relate how one of the pistols actually didn't exhibit any functioning issues during his usage in that environment. Besides, in keeping with the way things actually occur in the big, wide world ... I can think of a couple of instances where a couple examples of pistols from the same manufacturer which worked so well for that fellow in his instance, actually exhibited functioning issues on the range where I work, which is covered in sand, and which were seemingly related to sand, in the hands of other folks.
I've taken examples of quality pistols, often loudly lauded by many enthusiasts on different firearms forums, and experienced some occasional functioning issue, as well as observed other trained users experience occasional issues with them. It happens.
Talked to folks from other LE agencies who related functioning problems experienced within their respective agencies when it came to many of the well known manufacturers. It happens.
I've also attended various LE training classes over the years and had the opportunity to observe folks experience functioning issues with various manufacturer's makes/models/calibers service pistols, too.
Want to guess how quickly someone can become interested in what might've caused a functioning problem with a specific make/model/caliber, in the hands of a specific user, after a pistol was unable to be properly used because of a functioning problem in the middle of a deadly force encounter when shots were fired? "Brand loyalty" and personal favoritism quickly pales when considered against how lucky someone may have been in not being seriously injured or killed by gunfire when their issued pistol failed to properly function during a deadly force encounter. Excuses and brand loyalty become rather weak when considered against lives. Identifying the actual issues(s) involved ... whether it be individual firearm, ammunition, maintenance, environment of shooter-related ... and then taking whatever corrective action would seem likely to help prevent a similar occurrence, would seem to be the prudent course ...
Lots of high quality examples of semiauto pistols being produced. Doesn't mean problems won't occur.
Like most other folks, I have my own preferences when it comes to personally owned defensive pistols, based upon acquired knowledge and my own experiences ... and I've had confidence in the many issued pistols which I've carried and used over the years since we adopted semiauto pistols instead of revolvers. Granted, there are other makes/models in which I would also feel confidence if they had been, or were to be in the future, issued to me.
There are a number of excellent designs, produced as high quality pistols from reputable manufacturers available nowadays ...
Things happen, though ...
I prefer to be aware of potential issues which may adversely affect the normal functioning of my defensive pistols.
Just my thoughts.