Federal HST 9mm 124gr +P. I chose this because it has a proven track record with law enforcement, it’s widely available, and most importantly it functions flawlessly and groups well in my P30.
For pocket carry: Buffalo Bore .380 +P 90gr jhp and Hornady Critical Defense .380 90gr. Or .38 Special Buffalo Bore 158 gr LSWCHP standard pressure.
I’ve tested all of these in their respective firearms for function and accuracy.