You will find this is a debate that never ends. A very popular choice for the LE world and civilians is the Federal HST Tactical line of ammo. I carry HSTs in all of my 45s and 9mms. Once you decide on the brand your will need to decide on 124gr hollow point vs 147gr hollow point. 124gr is more popular, but I chose 147gr because I carry a P365 these days, and I was more comfortable with the recoil from this small gun. Frankly I'm not so sure it really matters as long as your choose a major brand that LE departments have chosen based on results, and go with it. More importantly is hitting your target. Practice, practice, practice until you are confident. Good luck.