Thank you John, Welcome to DRTV. The comp. pistols for SD have been debated here many times, and any non orthodox shooting stance, could cause injury, temp blindness at night, and what you described.
In regards to ammo, I have seen
some difference in flash with the only ported pistol I own which is an EAA Witness .40.

It is a sound pistol, that functions without fail. Federal and Speer exhibit more gas/smoke, while the Magtech and Winchester White Box, have more flash, (daylight shooting only)...but very prominent.
It is not my primary SD carry pistol, by any means, but is a reliable pistol with any .40 caliber ammo.
I need to get a non comp'd barrel for it.
In any other stance, firing a ported/comp barrel could be very dangerous for the shooter.