Consider comparasion between same states and same type of materials. also consider the substrates to have same surface quality. a substance with higher cohesive force would have a higher surface energy. this should be because of the stronger cohesive forces between molecules as the molecule on topmost layer is unsatisfied, now if we consider water & say mercury , Hg has a higher surface energy. so it will not wet the surface ? So will it be a good adherent? Also, can we generalise that higher surface energy is only for obtuse contact angles? Is there an exception?