The problem with Drought is that Ninetales is an atrocious Pokemon with no other redeeming qualities besides its ability, and forces you to start the battle as a 5v6. Outside of Ubers, sun could never be better than rain until a better Pokemon receives the ability.
Ubers is a different story, but it would take a lot to humble a monster such as Kyogre, and all the power he has.
Ninetales isn't the issue. Unlike Rain, most of the Pokémon that directly benefit from sunny weather, are also weak to Fire which is boosted by said weather. As the majority of good Rain Pokémon either resist, or take neutral damage from Water Type moves, it naturally has an advantage.
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Rain also benefits many more types/pokes than Sun does. With rain you can run Water-STAB abusers, Thunder abusers, Hurricane abusers, Dry Skin pokes, x4 Fire-weakness pokes, and....probably some other stuff that I'm forgetting.
With sun you've got like...Fire types....and grass types. And grass typing sucks, especially when one of it's weaknesses gets a boost in the sun.
So it's not just quality - it's quantity and diversity.
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