Shooting a big load is always going to be better. Women make a subconscious connection with bigger loads=higher fertility. And longer shots = better control/higher sexual excitement for the man. Think about it....if you were a chick, what would turn you on more:
A. a little dribble running down.....
or
B. a big shot all over her chest or where she wants it.....
It also helps to work those pc muscles. Practice by holding your pee in midstream for a few seconds a couple times a day.
Get to the point where you can hold back your load and still have an orgasm and you have mastered your cock.
Of course, letting go feels better