Hippos reputation as a killer is far more known than a Rhino, even crocodiles give them a wide berth. However, it is worth noting this reputation is enhanced greatly by the Hippo`s incredibly poor temper and aggression. Rhinos on the other hand are generally extremely shy, and would rather stand its ground in a defensive posture rather than all out attack. Despite this, I believe the Rhino would wreck the Hippo