Differerent brand and bullet weight, (Fed HST 147gr,) but the last info I seen on this subject was that +P in 9mm didn't add much in performance. It did add recoil though.
IIRC, our own BBI confirmed this. Maybe he'll be along to comment?
I like 147gr for self-defense in 9mm for the extra penetration. 124gr is better than 115gr penetration wise. Lately I've been running 124gr because at the time I needed to replenish supplies 147gr in any type was out of stock. So you shoot what you have or can get in that case.
I did buy 350rds on 115gr Nosler JHP Match awhile back because it was to cheap considering now days prices to pass on. It was almost the same cost to buy the same components and load it as it was to buy it factory made. Cannot pass in those deals.Availability is certainly a key factor these days. I also tend to favor heavy for caliber and like the 147gr, but the 124gr +P actually does penetrate more in one metric: Auto body testing. Of course how relevant that is to any given person depends on their circumstances.
115gr is very tough to get to pass the full FBI battery, as it tends to under penetrate in several of the tests. I don't know what the voodoo of 9 more grains is, but there's a definite trend of 115gr failing while the 124gr of the same brand will pass. That's not to say it's useless, you're still usually looking at 10" or so which is *generally* going to be good to go. Forearm strikes, shoulder/bicep shots from the side, etc. and it starts to get more iffy.