Oranos definetly
A very good Poseidon horse killer for several reasons :
Faster, so they can keep up with hips if they wanna flee.
Go Oceanus and do Weightless Mace, and Bite of the Shark. Both imrpove attack of cavalry counters (Murmillio, Katapeltes)
Shockwave works great on horse masses. It comparison to shockwaving a mass of inf it saves about double as much time for you to do something.
Possy is a boomer. Seeing all settlements is a keen way to find out when he is beginning.
In Heroic you get the best way to even with the hipps : Theia has Poseidon's Secret and Lance of Stone.
Dryads from Hesperideas are a good way to watch your base. They have lots of LoS. It is good when you spot attacking hipps early.
Only weakness Oceanus has is the cheiro''s. If possy makes inf and you want to counter them, they will get killed by hipps. Hipps are one of the best siege-killing units in the game. Especially with the extra speed bonus from Hermes.
fanatics will tear them up as well as katas.
FAC ID