Griffin build: Conductors of Magic and Igni or Piercing Cold and Aard?

Hey everyone, I’m currently running a Griffin set sign build and trying to decide between two different directions. I’m torn between going all in on Igni with Conductor of Magic, or switching to a Piercing Cold mutation and focusing more heavily on Aard.

For those who’ve played both setups, which one ends up feeling stronger overall? Which performs better against bosses?