OK just did a little quick research and found these loads .
These are the hottest heaviest loads I could find of factory ammo .
Buffalo Bore makes a 9mm +P+ JHP 147gr velocity 1,175fps
Grizzly makes a 45acp Xtreme HP 175gr velocity 1,200fps
I do not know how to do the math on each of these bullets but my bet is the 45 will have more ftlbs of force and create a bigger temporary and permanent cavity then the 9mm .
RBCD makes a factory 45acp load that is 115gr velocity 1,650fps I wonder what the math is on that one