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In overall terms of in-game use, Nidoking is outright superior. You can get the first form before you even enter Viridian Forest, and the Moon Stone to evolve it is just after Brock, meaning if you grind a little you can have a Nidoking by the time you leave Mt. Moon. It learns Thrash of all fucking things if you evolve it early, meaning it can basically one or two-shot all other Pokemon for a while. It learns a massive amount of TM moves AND has serviceable stats and speed to make use of them. It's outright an essential part of any team. It also managed to look badass in first gen when everything tended to look extremely fucking clownshoes.
Competitively, it's Rhydon. Nidoking is still good, but the weakness to Psychic is rough and Rhydon just makes his movepool worth more with those stats.
Now I wanna use Nidoking again, fuck.