For me the 357 mag is the king of the hill for SD revolvers.
I understand that velocity is not the end all, for me it is consistency. I do not reload for max velocity, I reload for max accuracy and consistency, shot to shot (which is where accuracy come from).
It is really a Ford vs Chevy standard vs auto debate.
I believe I went to great lengths above to point out that "that extra 200 fps" may or may not be there.
Even if it is there,,,,I highly doubt it makes any difference at all @ SD ranges, which are measured in feet not yards.
Stretch that range out to yards & - yes - velocity becomes more important.
It is always important, at any distance. That is why the 357 is so much more effective than the 38+P.