.25 ACP is superior to 22LR
All over the "Interweb" you will find folks regurgitating the myth that a 22LR is equal or greater than the 25ACP in terms of muzzle energy.
What a lot of hooey!
This is most likely due to fact that most 22LR ballistics data is based upon much much longer barrels than found in pocket pistols. North American Arms has some good actual performance data on the 22LR from a short barrel. Here is the link: North American Arms Ballistics
The fact is that the 25 ACP packs 25% more poop merely because the standard 50 grain bullet is 25% larger than the typical 40 grain 22LR bullet. Both cartridges leave the end of the same length barrel at about the same velocity. Typically the 22LR is actually lower than the typical 25ACP.
Comparing a 50 grain 25ACP bullet to a 40 grain 22LR bullet at 750 fps muzzle velocity shows 62.4 vs 49.9 foot pounds.
(Mass in grains times Velocity in feet per second squared divided by 450400 = foot pounds energy)