“Even though bigger, might be better than a 9mm with kickback or whatever they do plus easier to aim.”
My unsolicited advice is that you “try on” different guns to see what suits you best. There are gun shops which have their own indoor ranges where you can test-fire a weapon before you buy anything. Talk to people who know what they’re doing about what your needs are and figure out what the best firearm is for you.
Practice firing whatever you end up buying. Get familiar with it - you don’t want to flinch when you squeeze the trigger “for real.” Learn how to take off the trigger lock (if you must have one) and load/cycle it in the dark, and probably a dozen other things.
Again, just my unsolicited advice.
Honestly, I would rather not have to even consider going this route and maybe I'm feeding into fear, but should think about preparedness.
A one-shot shotgun even is better than nothing. Never been in a gun store in my life! Plus I would hope I would never, ever have to use it even on an animal. But things are so different now.