For crucible, you'll build your super quickly by getting kills so no need to focus on intellect. You need your abilities to get them efficiently. As a sunsinger I try to max out strength so that I can always get my flame shield and discipline comes second since with voidfang vestments and the right perk you can spawn with two grenades. Crank the agility up to max and recovery second, inside the crucible armor means next to nothing (at least I don't really feel a difference).