Based on the one shot chart you could draw the conclusion that it suggests .32 is the preferred caliber. That is not the conclusion of the study:
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Some people will look at this data and say "He's telling us all to carry .22s". That's not true. Although this study showed that the percentages of people stopped with one shot are similar between almost all handgun cartridges, there's more to the story. Take a look at two numbers: the percentage of people who did not stop (no matter how many rounds were fired into them) and the one-shot-stop percentage. The lower caliber rounds (.22, .25, .32) had a failure rate that was roughly double that of the higher caliber rounds. The one-shot-stop percentage (where I considered all hits, anywhere on the body) trended generally higher as the round gets more powerful.
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I do agree that having a gun is priority one and that there is little difference in service calbers. 380 is the smallest round I carry, but if I had a 6 shot revolver in. 327 mag I would sometimes carry it. 9 mm is my preferred EDC based on my experience and research. Knowing ones abilities and limitations with training and practice to minimize those limitations is the key.