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You got chakra right, actually 🙂 'Kai' is normally 'ki' or 'chi' though.
Anyway, none is inherently stronger than the other, what matters is the amount.
X amount of magic is as strong as X amount of chakra is as strong as X amount of ki.
In some universes it's easier to make one or the other, though, and some forms may be more flexible in what they can do than others.