M&P Shield .45, H&K USP .45 if you prefer DA/hammer-fired.
The best carry .45 is one in 9mm.
More ammo, cheaper practice, less recoil, works just as well.
Look, it's cool if you like 9mm Luger, it most certainly has its advantages, and it's plenty powerful enough to get the job done, but when you start using the whole "just as effective" shtick, you only make it seem like you're compensating.
Sure, 9mm Luger may appear deceptively equal to .40 S&W and .45 ACP in ballistics gel testing/statistics, but in real life applications it's still a smaller, lighter, projectile which cannot match the energy transfer of larger, heaver projectiles which simply have greater momentum.
And if you're going to base the effectiveness of a cartridge on the results of ballistics gel tests/statistics, then you might as well drop the 9mm Luger for .380 ACP because it comes in smaller, lighter, less expensive, easier to carry firearms, has less recoil than 9mm Luger, and works just as well.
That being said, if the TC wanted a 9mm pistol then he would have asked for suggestions on a 9mm pistol. Your post was unnecessary, unhelpful, inaccurate, and just comes off as though you felt the need to chime in pushing 9mm because you're insecure about the cartridge you're carrying.