According to Gary Roberts, as of 2016-06-01, he recommended these:

Barnes XPB 115 gr JHP (copper bullet)
Federal Tactical 124 gr JHP (LE9T1)
Federal HST 124 gr +P JHP (P9HST3)
Remington Golden Saber bonded 124 gr +P JHP (GSB9MMD)
Speer Gold Dot 124 gr +P JHP
Winchester Ranger-T 124 gr +P JHP (RA9124TP)
Winchester 124 gr +P bonded JHP (RA9BA)
Winchester Ranger-T 127 gr +P+ JHP (RA9TA)
Federal Tactical 135 gr +P JHP (LE9T5)
Hornady Critical Duty 135 gr +P PT
Federal HST 147 gr JHP (P9HST2)
Remington Golden Saber 147 gr JHP (GS9MMC)
Speer Gold Dot 147 gr JHP
Speer G2 147 gr PT
Winchester Ranger-T 147 gr JHP (RA9T)
Winchester 147 gr bonded JHP (RA9B/Q4364)

Source: https://pistol-forum.com/showthread....f-Defense-Ammo

I currently use 147 gr. HSTs, but will be switching to 147 gr. Gold Dot G2, only because the newer batches of 147 gr. HSTs do not have the same POI as the older batches, and thus do not match my practice ammo (Speer Lawman 147 gr.).