i would go with the beretta if you have to move through the house, if your going to sit tight i would use the shotgun even with lower training and keep the handgun with you should you have a malfunction. i'm in somewhat the same situation as far as training with my firearms. i'm well more versed with my handguns and rifles than i am with my shotguns. i'm not a novice with my shotguns but i have considerable more trigger time with my other weapons.
i have two shotguns in my home ( an 870 and a mossy 500 ). i keep one in my bedroom and one in my den, next to them i keep one of my handguns. i also keep a pistol on me or beside me until i go to bed. imo the pistol just makes more sense when you have to move through a home either offensively or defensively, being able to move quickly and smoothly will most likely play a bigger factor in surviving than what you brought to the fight.
i have two shotguns in my home ( an 870 and a mossy 500 ). i keep one in my bedroom and one in my den, next to them i keep one of my handguns. i also keep a pistol on me or beside me until i go to bed. imo the pistol just makes more sense when you have to move through a home either offensively or defensively, being able to move quickly and smoothly will most likely play a bigger factor in surviving than what you brought to the fight.