As far as which would be worse to be hit with:
I'm not sure, but my gut tells me I'd rather be shot once than twice.
As far as which would be worse to be shot at with:
If I were running a serpentine away from someone, I'd definitely prefer they take one shot to two.
As far as knocking down steel plates goes:
I bet throwing a cabbage at them would have been even more effective than the .45. And yet, I'd far rather have cabbages thrown at me than be shot at.
si vis pacem para bellum