Four hearts receives the top award, because this hand, containing eight probable winners, exactly meets the rule for preempting: within two tricks of the bid when vulnerable; within three tricks when not vulnerable. A pass ranks second, since you may get a clearer picture of your potential after someone else opens. One heart may wind up fooling partner and creates rebidding problems. Three hearts is an underbid that gets no credit. When you preempt, you should bid the full value of your hand.
If the opponents have the cards, a bid of three diamonds has preemptive value. Quantitatively, your hand may qualify for an opening bid of four diamonds, but when partner has not yet spoken you should not preempt in a minor suit at a level that rules out the possibility of playing in three no trump, unless you have an extreme freak. Therefore a pass receives a higher award; at your next turn you may be better able to judge the hand.