I get the argument one the why. It's easier to conceal a larger handgun with more clothing and more clothing MAY impact bullet performance.
However the counter argument is that it is much easier to maintain proficiency with a single firearm than two. I don't see switching from a 9MM in one platform to a .40 in the same platform gaining much. Maybe a .357 SIG? but I doubt that gains you enough to matter.... Personally I would not do it.
Pick your firearm, gain and maintain proficiency with it, and carry good defensive ammo. Then quit worrying about it.
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