If you were the Emperor, who would you pick to be Warmaster?
With the benefit of 20/20 hindsight of course ;)
Definitely not Horus that's for sure.
Obviously some primarchs would be bad choices: Angron, Curze, and Mortarion are "broken goods"
Sanguinius seems like an obvious choice...but he and his legion suffer from "secret flaws" with the potential to be exploited by Chaos
Would you pick someone with unshakable loyalty such as Dorn or Guilliman? Do you think other less conventional choices would work?