with ds#1 my right gave lots more (probably 2x) than my left & he had a preference for the right.
With ds#2 he has always had preference for the left & actually stopped feeding from the right at about 9mo & now at 15mo just feeds from the left... I pumped less with ds#2 & mainly only from the right side, so not sure if it supplies more or less this time around, but get the feeling this time around my right was the lower producer