I don´t know the answer to your above question, but I´ve read through this thread and I see you have been provided with good advice on a variety of rounds for SD purposes. They´re all good, and no one is a best fit for every possible situation or scenario. Differences in performance will not be that great.
IMHO, you have to start making up your mind on which to choose for defense purposes and train with it for a while. If you find something you are convinced is better you can always switch, but be sure to practice and practice until you´re good with it and until you´re convinced your weapon is good with it.
All the ammo discussed in this thread is excellent IMO.