It's a purely subjective subject. Any currently produced modern design JHP ammo will serve it's purpose. Me personally I use Federal 147gr Hydra-Shoks. I used to use the 124gr but switched several years ago because I decided the trade off in slightly lower velocity was negligible and it puts a little more mass on target.
This is almost a heated a subject as the "Great Caliber Debate". Personal preference and whatever you can find readily available will dictate the choices for most people. Performance is pretty equal +/- a very small margin. Whatever you choose to go with, make sure you shoot it from time to time. Mostly to determine and recognize any difference in POA/POI compared to your regular range/target ammo. The difference between 115gr ball and 147gr JHP can be significant and knowing the difference can be very crucial "in the heat of the moment".
Training with and getting/maintaining muscle memory with your SD/HD ammo is something everyone should be familiar with IMO. Shot placement trumps caliber whatever you are using as far as I'm concerned. If you can't place your shots it doesn't make much difference what ammo you are using now does it?