I would say the ants.

Termites would be the equivalence to a hippo in or out of water (wood, for them) while the ants would be hyenas. One on one, the termite would win, but ants tend to have the numbers and their bodies are more built for tearing tearing apart flesh/exoskeletons. With termites, it only really the soldiers that are capable of attack/defense while most ants in a colony are capable of such.