Guess I’ll bite too.
S&W M&P 2.0 9c (it’s what I have). 9mm is abundant and it’s ran flawlessly for me. It’s a proven in my experience.
Frankengun AR Pistol in 5.56/.223 (I’m building this myself, hence the frankengun moniker). With a red dot (probably reflex) and back up irons, a weapon mounted light and angled foregrip. More oomph than a handgun, more range, excellent defense within 100yds. Also abundant ammo.
Precision rifle chambered in 7.62/.308 with a quality high power scope. This is my catch all so to speak. I can keep aggressors at a distance, or if things go long I can hunt big game with it. Once again, ammo is quite common.
Depending on the exact situation I would be trying to stay low key with my family to ride out the storm. We don’t have a lot of things like this to worry about where I live, it’s primarily a lot of very small communities spread out over a 60 mile radius or so. The nearest big city is a minimum of a 2 hour drive away.