A boy who says he'd choose his mother is just that - a boy. One who still needs his mother. When/if he matures enough to realize the sanctity, permanence and responsibility of marriage and his responsibility to be a husband, he will say "I must save my wife". This is what the catholic priests attempt to bring out during the "pre-cana", or pre-marital counseling sessions. Its to protect the potential wife and to help the potential husband realize his responsibilities. A mother of a wedded son has lived her life. A wife has just begun hers.
Totally agree.