Currently Hyuuga is the strongest. I don't remember in the manga a comparison regarding the strength of the Hyuuga and Uchiha clans (not a single ninja from the clan as a representative). The fact that the whole Uchiha clan being destroyed in a single night, I will go with Hyuuga. We have yet to see the limits of Hyuuga in Neji. Also, if a single representative is accepted to show the strength of a clan, I will go with 3rd Hokage's clan assuming he is a member of a clan.
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