Yin and yang are more about opposites (dualism) than anything judgmental (good and evil), or that is my understanding. Interesting note: the Wikipedia page doesn't have the word "evil" anywhere on it, though there is a brief mention of "good and bad" basically stating that's not what yin and yang are.
Anyway, I think there could be some value in this (yin/yang) comparison, but there may also be some drawbacks to consider while moving forward. One drawback is that a "random american" (or even other people, assuming there is anywhere outside America), might have the same understanding, and labeling either distribution evil/bad would at least be not-good for its reputation. Even if that is avoided, are SLE and Leap opposites? One feeds into the other, and in the same way I believe Tumbleweed feeds into Leap, so I have typically appreciated (as somebody who has been around SUSE for a while, so not a newbie in that regard) more of a continuum of Tumbleweed -> Leap -> SLE, which can celebrate the fun/excitement/newness of Tumbleweed, the practicality of Leap, and the stability of SLE without passing much other judgment.
Just some thoughts,
Aaron Burgemeister
Identity / Security / Linux Consultant