Is there really a meaningful difference in real-world accuracy in duty/carry handguns of modern manufacture?
I find my Walther PPS and compact 1911 to be very accurate when I do target work with the goal of punching small holes in targets, neither is a match gun or dedicated target pistol, but each is mechanically sound and has good enough sights and ergonomics to allow me to make pretty holes in paper to hang on the fridge.
Now, if one were putting their handguns into Ransom rests for self-defense purposes, it might matter, otherwise I'm thinking that the gun with a fixed barrel or at least sights mounted to the barrel will do best ... I think the new Detonics is planned to have the front sight built into the barrel rather than the slide, my old Walther P.1 has the front sight on the barrel instead of the slide, I think (correct me if I'm wrong) Lugers had sights and barrel fixed together, and there must be others I'm just not thinking of.
Operative factors I can think of; sight radius/design, ergonomics, trigger quality, lockup or having sights and barrel fixed, consistency of cartridge, quality of barrel, degree of recoil's effect on ballistics ... ...
there's probably more, too many variables and no real-world testing may mean no meaningful answer here.