Alright, type A: Kyuubi's full power is equally divided in 9 fractions, each represented by a tail.
Type B: every time another tail appears, it is multiplied by 2, so nine-tailed form has the power of 2x2x2x2x2x2x2x2x2 tails, which is expressed as 2^9, totaling 512 times the power of a single tail. Going by what we have seen, I wouldn't say there's SUCH a huge difference in power between the last two (256 "tails" higher).
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