Hades is immortal but unless he can rip out Ares soul (Which i doubt he would have the time to do) he gets slaughtered, yes he is powerful but Ares is the much better fighter and wields a magical weapon. Add in superior strength and experience.
Hades should take based on hiearchy and scaling, but I think Ares has the best on-screen feats in Greek Saga.
Casually creating a universe, creating Galaxies with MFTL speed, then showing full Reality warping in that universe, including warping gravity (Gravity was Earth-like in bunch of rocks floating in space), creating Kratos clones, and then reality warping Kratos and taking his weapons and powers from him without even appearing, all of this while telepathically speaking to him who knows from where, maybe light years away.
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