Dominance is dynamic in nature. Superiority is static in nature. Dominance is proactive. Superiority is passive. Dominance is comprehensive.
Superiority is specific.
Dominance is decisive. Superiority is some advantage. Information dominance means ruling the infospace. It is fairly easy to judge, after the fact, which force had information dominance. It is far more difficult and imprecise to render this judgment during an ongoing operation.