Coming out of the same frame, a majority of people are going to feel less recoil from a 9 mm than a .40. Will that affect your score in a bullseye event? Only if it gives you a case of the yips, I would think.
As for effectiveness in self defense, modern loads of all the major calibers are reasonably close in performance.
Net: Shoot what you shoot well.
The rotating barrel of the Beretta Storm series (except for the subcompact version) makes a noticeable difference in reducing recoil. My daughter has a 9 mm compact and it shoots even a little softer than my 92FS. A lot of people say that a .40 out of that pistol feels like a 9 mm out of others, and that 9 mm is almost as soft as a .22. That might be a bit of hyperbole, but it is not far off in my limited experience with the Storm.
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