Buff Buu would be the stronges
but since he is not an actual form of Buu,
the strongest Buu is Mystic Buu.
The strongest non-fused Buu is Kid Buu.
Ultimate Buu (The strongest form by far)
Kid buu ( strongest non-fused & the original form)
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Ultimate Potential Buu (Super buu / w Gohan absorbed) is the strongest out of all Buu's forms.
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Defense.
Kid Buu is first seen in the episode, "Evil Kid Buu".
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