Quote:
All other things equal, shorter barrels give better accuracy because they are stiffer. Read up on barrel harmonics to understand.
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All things are never equal.
Accuracy should be pretty close. The effects of a "stiffer" short barrel have a marginal effect on accuracy.
The positives of a longer barrel have to do with increased velocity and recoil dampening from the greater weight. Given this is a pistol caliber those gains will probably be relatively marginal as well.
There might also be a slight advantage with a longer sight radius.
I'd suggest picking barrel length, in this case, on how the gun feels.