One of the best of a very small group of 9mm cartridges that will really get the job done is not even a +P or a +P+.
That round is Winchester RA9B, or if you aren't worried about shooting through auto glass, Winchester RA9T.
Of course, some others that have good street performance are, in no particular order: Federal 9BPLE, Winchester RA9TA, Winchester RA9115HP.
Others swear by the Speer 124 grain +P NYPD load, but they seem to have this Phase 3 malfunction problem and I have never been fully sure that it is not an ammo problem versus a gun problem. I have not used that ammo and I have never had a Phase 3 malfunction.
There are probably others, but I like RA9B or RA9T the best these days.