Not all "FMJ" ammo is created equal, nor is "HP".....Myself, when it comes to the 9MM cartridge, I much prefer 124 GRN to 115, no matter the bullet style. Besides the weight aspect, there's also the power factor, which can vary quite a bit from brand to brand, and loading to loading. Just as one example, there is a lot of difference between Winchester 124 NATO FMJ and say, Remington's green or yellow box 115 FMJ. As a matter of fact, some lots of the Remington is so weak that neither of my High Power pistols would reliably function with it....Meaning that one is obviously much more desirable than the other for my purposes....Plus, even if a given HP bullet expands as advertised, hollow points ain't always the best answer for a defensive pistol because a lot will depend on the circumstances.
You can take it from there.
DGW