Don’t get wrapped up in +P. Standard 9mm ball ammo of any flavor will go straight through the human body without issue. 9mm is already a high pressure cartridge. What you should concern yourself with is the ability of the projectile to deliver the maximum amount of energy before exiting the target. That usually amounts to a round that will expand to a maximum diameter and stay in tact to deliver that energy all the way through, creating a very large permanent wound channel.
That can be achieved with standard pressure cartridges. The ones pictured below are my choice as I have consistently measured .7” of perfect expansion and always in tact when recovered.
You can get real close to the energy created by a round using the following formula:
(Weight X speed X speed) / 480,000
Where weight is the grains of the bullet and speed is feet per second. Again, a higher energy round isn’t necessarily better unless it’s able to dump that energy into the target. If it comes out the back side of your target still carrying a significant amount of that energy then that extra energy is kind of useless.
Higher pressure doesn’t always equal more energy.