In the case of home defense, the firearm is just 1 consideration.
The core consideration is... oddly enough, your home.
Depending on how your home is laid out (single family free-standing, apartment, condo, etc.) that will have the largest impact in planning your home defense needs and how to meet those challenges.
In most cases, the most common and reasonable home defense scenarios and tactic is to "withdraw to as safe a position as possible and hold out until the good guys (law enforcement) arrive".
So, what kind of home are are you planning on defending?
English
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another great post by Recon, and one of the few bits of sane/valid advice in the thread.
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I was wondering if/when anyone would address the question of "what are we defending and what is our defense plan?" That is many many times more important to consider and will result in a wiser decision if/when a firearm is purchased. Just saying "get _______ it's what I have or what I think is good" is not the best advice to give someone who is just considering home defense. Who is in your house (OP said they live alone, which simplifies things, family and especially kids make it far more complex), how is the home laid out (single/multi story), what is its construction and type (free standing CBS or brick, a woodframe duplex, a steel and drywall condo, etc.) each of those issues not only play into choosing a weapon, they help a homeowner decide HOW they will defend (preferably withdraw, call for help, barricade and reinforce, hold out until help arrives) as well as choosing WHAT to use as a part of that plan.