I've got multiple square and round butt J Frames. While I do prefer the RB for concealed carry, I do prefer shooting the SB (when firing more than a box at a time) as they give a better grip surface to hold onto.
These days with the aftermarket grips, one can have many options to re-grip a revolver with - be it a RB or SB. Both have their pluses and minuses and much is personal preference.