What's your favorite universe story?

Might fill me in on them, I don't fully grasp the concepts of universes besides the A-types being those with u resolved certain incidents. Personally, I'd go for one of three routes, A7,A8 or Lw0. cause honestly, an eternal winter or night back in the golden age of touhou sounds great to go by. just as much as a universe where everyone are turning to spirits. I like humans as phantoms a lot more than mortals.