Poliwrath, because dynamic punch and unique typing resistances.
(Although he is kinda outdated as of gen3, still a good pokemon)
Politoed is just another trophy water mon
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I'd say Poliwrath overall. But I suppose Politoed as a gym defender could surprise electric types with hard hits from a double ground moveset.
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Poliwrath. It has a higher attack stat and a more useful typing and movepool. Neither of them are relevant as water pokemons, Poliwrath is somewhat relevant as a fighting pokemon (less so with gen 3 now).
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Wrath for same as others have stated. It's also mvp for fire blast ttar raids with RS/DP moveset
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Poliwrath, it can actually be used in several ways.
Bubble + Hydro Pump: a tank against Feint Attack Ninetales.
Rock Smash + Dynamic Punch: a tank against Fire Blast Tyranitars.
Bubble + Dynamic Punch: a tank against Regirock without Thunder movesets.