I prefer a square butt myself. The rounded bottom of the RB helps conceal the gun better (less printing), but, when gripping the gun, it's material that's not up against the butt of my palm firmly.
Fortunately, you can have both with today's gun: "Conversion" grips fit RB gun guns, but have the outside dimensions of a SB grip. Be sure the description indicates it's a "RB conversion" grip, though.
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