I would have to be in the situation to truly know.
Will the 1 handgun be used for everything? If yes, G20
Can I still have my AR, AK, Ruger 10/22, Rem 870/700, bows/crossbows etc? If yes, G27
The two loudest sounds known to man: a gun that goes bang when it is supposed to go click and a gun that goes click when it is supposed to go bang.