It's not just that 3-1 is more common than 4-0 as you are looking at specifically 1 out of 2 possible 4-0 breaks against 1 out of 8 possible 3-1 breaks. The odds or 4-0 are 13/26 * 12/25 * 11/24 * 10/23 = 4.78%, the top line of each division being the vacant spaces in the hand you want the card to go and the bottom line the spaces in both hands at the time each is dealt. For 3-1 if you assume the Q dealt first it is 13/26 to go in the right place, then the next 3 cards are 13/25, 12/24, & 11/23 which comes to 6.22% (and you get the same number if you repeat it for the Q dealt 2nd, 3rd or 4th). so the relevant 3-1 break is 30% more likely than the relevant 4-0 break in the cases where one of these two breaks occur.