Moro Dark or Undead set?

[BB Shockwave]

That's easy. Speed and Intiative are much more important, you can increase morale in other ways (Necromancer's plague, for example) and the Might skill that boosts undead attack/defense is a better substitute. Trust me, I have just finished The Legend with an all-undead army some months ago, that +1 speed makes a lot of difference for Black Knights and Ancient Vampires (in vampire form), turning them into quite fast skirmishers instead of slow tanks.