What is more fulfilling, sex or ejaculation?

you may find it strange about the question , but there are certain people who practice coitus reservatus , that is sex without ejaculation. And if ejaculation would be the answer, why just masturbate instead of using another person who is out of mood for sex. And the practitioner of coitus reservatus claimed that it is more fulfilling to have sex without ejaculation and just give priority for the women to reach climax , even several times.