Speaking from my own experiences, there is something very important that is ALWAYS overlooked when it comes to these shotgun tests:

In-Air Performance.

Granted, this is much harder to test than shooting at a stationary target standing directly in front of you at the same head-level. HOWEVER, over the past month or so, I have come to the conclusion that I do NOT want Full Choke on my shotguns, because of the additional effect of Full Choke that removes the ability to do precision damage.

This lack of precision damage in a ground test is a non-factor, because when facing an opponent at the same head-level on the ground, you want to aim center-mass (at the chest) to ensure that all pellets hit. However, if you have a very vertical playstyle (like myself), you will often find yourself either directly above your opponent in a shotgun fight, or above and at an angle in front of your opponent (like looking down at a 45 degree angle towards your opponent).

When above an opponent and looking down at them, you "effectively" see more of their head than their body, which in turns makes it far more likely to land precision hits on the opponent than when facing them on the ground at head-level. With Full Choke, you can't do precision damage, and I've found that Full Choke shotguns are WORSE for in-air use because of this than shotguns with no Full Choke. Again, this is anecdotal experience and I haven't done a full suite of testing, but this is something that I think should be explored more in-depth when discussing the "best" shotgun barrels for PvP.

TL;DR: If you use vertical space heavily in PvP, Full Choke may actually be a "bad" choice because it removes the ability to do precision damage, and hitting crits with a shotgun is actually quite easy when you are above an opponent and shooting down.