Utility is chiefly used in the sense of some immediate or personal and generally some material good.
Advantage is that which gives one a vantage-ground, either for coping with competitors or with difficulties, needs, or demands; as to have the advantage of a good education; it is frequently used of what one has beyond another or secures at the expense of another; as, to have the advantage of another in an argument, or to take advantage of another in a bargain.
Gain is what one secures beyond what he previously possessed.
Benefit is anything that does one good.
Emolument is profit, return, or value accruing through official position.
Expediency has respect to profit or advantage, real or supposed, considered apart from or perhaps in opposition to right, in actions having a moral character. Compare UTILITY.