Byakugan or Sharingan

[FFVII]

Which of the bloodline traits do you think is better?There were rumors of the sharingan originating from the byakugan and it formed when a women from the Hyuuga clan married a Tengu, a creature that resembles a crow the was said to be a shapeshifter and was able to control the minds of human and drive them to insanity, but i'm not sure if it is true or not. I think that the sharingan is better only if it is in Mangekyo form.