There are so many diverse answers to this subject.

But, as I see it the basic facts boil down to this

Most(but not all)use of a handgun for self defense fall under these circumstances:

Poor or low/no light conditions
3-7 yds
Awakened from sleep
Surprised or ambushed (parking lots,carjackings ect.)

Take a moment to think how well you are prepared to defend
yourself under those parameters. What will your reaction time be? Can you identify your target, with no doubt in your mind. Are bystanders or family members at risk if you fire? Where will your round end up if you miss?

It's not the number of rounds you have available.It's the one(s)that you put on target.

Just my honest opinion.

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Take your time..quickly.