A few notes on that, practice and training is super important. Having the capability and confidence to use ur firearm effectively is vital. Are you able to set up a home range at your property? Is it legal and safe to shoot there? If so thats great. Its also a good way to inform ur neighbors (in case any are shady) that you can take care of yourself. Making it clear youre not a victim will help keep predators at bay. That shotgun will have some kick but doesnt need as much skill to be effective. The AR will have quite a lot of penetration and requires a bit more skill and setup. Honestly a handgun would be a good way to go, its effective and easy to wield. It takes more skill to master but its very maneuverable and manageable and can also be concealed if you want.