I will just throw this out there to add my 2 cents worth, you can listen or flame me I do not care.
IMHO, +p & +p+ are worthless and abusive to the firearm. These high pressure round wear you pistol and lead to breakage's and inaccuracy.
Standard pressure modern defense ammo is very effective and more controllable, leading to faster follow up shots.
Which is better, one over-pressure shot or two standard delivered quickly on target?
Bottom line (And I am parroting Jame Yeager) If you need more power then a 9mm or 45, then you needed a rifle or shotgun to start with.