Most of the replies have made valid points. I would suggest that you go to a range and fire both yourself. Both have adequate stopping power. Just remember, shot placement, shot placement, shot placement.
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My vote is actually 40 as well. I was just curious to see what the ODT had to say about it.
I'd buy the 9mm simply because it will be easier to sell/trade it if you want to. Performance DIFFERENCE in the real world won't be enough to matter.
FTFY... ....mikey357