I'm not much of a theorycrafter, and I'm still in the process of deciding if going Unholy or Frost in Legion. I read several times that usually Frost is better when undergeared (i.e. at the beginning of an expansion), then Unholy clearly wins over time.
Why is that, exactly? Is it due to Mastery, or 2H weapon damage scaling? Is anything changing on this topic coming Legion?
Thank you in advance.