You'll never get consensensus, but I do believe the 9mm will hold a small advantage overall. I cannot offer proof, but based on my personal experiences I've had far fewer malfunctions with 9mm than any other round. More with 45 than any other round with others somewhere in the middle.
My theory is that it is not the smaller size, but that it is longer in relation to diameter and that the cartridge tapered, slightly smaller diameter at the neck than at the base.
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