i did some fooling around once setting off primers by heat, and seriously, I found no discernable difference between various types of primers. they all went bang to about the same sound.
I suggest that you load up a few empties with both types and se what you find, if the large seem to put up a bigger flame or lowder detonation when fired.
With 231 your powder and ignition are already going to be very fast. I don't think that the new small primers are going to make any difference.