I've learned a few things in the field over the last couple decades and about top of the list is............ Carrying 2 guns is a just about waste of time and energy. I don't care if it's 2 long, 2 short or 1 of each. Only reasons I have ever found for carrying 2 guns is:
1) Carrying a centerfire handgun for protection from critters that might eat me if my primary is a .22lr (not applicable here in Iowa)
2) Carrying a .22lr handgun to finish game with teeth when my primary is a centerfire or a shotgun.
Basically, make a decision and go with it. Ya, no gun will cover every circumstance, oh well. Better than the alternative.