I am on my second .40 S&W pistol. The first was an M&P40 made in 2013, it had a really really bad trigger. The trigger didn't improve after 400rds and cleaning and lubrication. The trigger was extremely gritty feeling, had a higher than average pull force, and the reset wasn't very nice. Also the trigger itself would cause my finger to be rubbed raw in a small area. I know how to properly operate a trigger. Now this is probably a 1 in 1000, but I didn't want to spend any money on aftermarket trigger parts and didn't want to be without a gun while waiting on S&W to fix it, if they would have even fixed it. I had to sell the gun.
I now have a Walther PPQ and voted on Walther. I only have had this ppq for about 2 months and have only about 300rds through it, but I really love this gun. The trigger is the nicest I have felt of any striker gun, the grip is the nicest of any striker fired gun I have handled, it is fairly lightweight, fairly slim, comes with adjustable sights factory, and is very accurate. I am still getting used to the trigger but at 5 yards I can get 4-5 shots all in one hole if I do my part.
Walther has a lifetime warranty as well to the original owner and has been around a long time. The PPQ is almost identical to the legendary P99, and you can pick if you like the lever style mag release or the button release.
Also, the gun has traditionally rifled barrel, which means you can shoot full lead bullets or whatever you want out of it.
What really sold me on this gun was the feel in hand and the trigger, I have not felt a better grip or trigger on a striker fired pistol. Also this is the only pistol I have EVER handled that I can drop the mag with my thumb without changing my grip at all. Which is a huge deal for me. I can keep the sights on the target completely and drop and insert a mag.
Any of them will be accurate and reliable, though I have heard of problems with CZ .40s, but I would still buy one. Basically all of them are great, the most important thing is what feels best in your hand, and what trigger you like the most. These two factors will be your accuracy.