I've shot feral hogs and loose windshields with both heavy and mid-weight 9mm JHPs(Ranger Ts and Speer GDHPs), and with .357sig(GDHP), and have yet to see a difference beteen the 2 cartridges.When you do your part, and choose a good JHP that will do its part, the difference in all the common self defense calibers isnt big enough to fret over.

In your position, I'm either making the jump to .40S&W or maybe a good .357mag, .41mag revolver.