I would say it depends on the situation. I believe both the pistol and shotgun would both be fine HD weapons. That being said, I would reach for my 870 before my HK UPS45c...the reason for that is because If I am woken up in the middle of the night, I won't be fully awake, so I want a firearm that would give me a better chance of hitting my target. Another reason I would reach for the 870 is because once I pump the 870, the intruder will know that I am armed and he/she might decide to flee the scene. For HD I feel that the shotgun is the best tool for the job. No offense to those that feel the pistol their weapon of choice.
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