Thanks for reaching out Franklin! The Px4 Storm Compact isn't an overly picky handgun – any mid- to -high-quality 9mm ammo should perform satisfactorily. That said, I have heard a few folks say that Speer Lawman 124gr TMJ ammo works especially well for target shooting: luckygunner.com/9mm-124-gr-tmj-speer-lawman-53651-50-round
And if you are going to go that direction, Speer Gold Dot 124gr JHP ammo would make an excellent choice for personal protection. It's designed to match the performance of the analogous Lawman target ammo very closely: luckygunner.com/9mm-124-grain-jhp-speer-gold-dot-50-rounds