here's my view on what you said.
you have that spare 9 that you are already familiar with. you used it as a carry gun.. your hand is fmailiar with it and you can operate the controls... thos are plus's and it's free.
I'm mostly a semi auto guy.. but do own a couple revolvers... and those revolvers are my first go to for the home defense setup the wife and i have worked out. here's why. as you stated.. revolvers are pretty plain and simple and don't jamb. pretty much pont and click.. da function is fine. My wife.. simply has difficulty operating the slide of most semi auto pistols. the large frames like 1911 are too much recoil spring for her.. the smaller semi auto aren't enough gun for her to get her hands on for a grip. She CAN operate a revolver..and she CAN operate a pump action on a shot gun. thus we have a multi stage defense plan. a revolver on each side of the bed for immediate respons. have tactical flashlights too. i have a couple different carry guns i use depending on clothing and season, and my cary gun ( all semi auto ) are within reach, as is the revolver, of my sleeping position. same with a pump action 12g. easy reach.. though all weapons mentioned are concealed and hid.
in the first moment of emergency, the revolver is an easy grab and shoot and drop gun... you get 5 'bangs' with 99.9% chance of correct operation, and no slide or safety to fumble with.. that
s a drop gun.. fire and drop.. no fumbling with reload. them 5 bangs lets me decide if I need to go to my semi auto or the party pleaser. during this time the wife has her own gun and her job is to get on the phone and get into the side romm while I'm covering. we have further plans for extended situations or multiple attackers.. etc..