I have read recently from a number of sites that "The three or four best .380 JHP rounds have better stopping power than ANY bullet fired out of 2" barrel .38 Special snub-nose." (Source)
Since what I mostly carry is a S&W 640, I am debating picking up a .380 pistol -- looking mostly at the Bersa Thunder. If the statements about the relative effectiveness of .380 vs .38 out of a 2" barrel are widely held to be accurate (better if i can find experimental data supporting the claim), it may actually be a better carry choice. 7+1 rounds in the pistol as opposed to 5, thin spare magazine vs bulky speadloader, flatter gun so as to print less in my pocket -- if the .380 truly is comparable to or better than the .38 in a 2" barrel.
The ammunition I see recommended most is Cor-Bon 90 gr. JHP.
Any thoughts, comments, counterpoints?