This is an odd sub forum to have this discussion in.
But I suppose the caliber debate knows no bounds.
I was at the range the other day after re-upping my membership. This guy was commenting in a slightly whiny manner that he was shooting low-right with his 9mm shield and was asking my advice.
I picked up his shield with lazer doombringer and colored in markings, put one round in a magazine, established my grip and breathing and plunked one round, COM on the head. 25 feet. Dude was looking at me bug eyed.
The important thing in this is that 9vs40vsbunghole does not matter unless you can pick up said weapon platform and fire one round out of it, putting said round exactly where you want it to go.