What is your favorite ultimate ability for that class?

I like the Elven Special Ability the most; it works flawlessly in all situations. I always try to get Luck in Heroes of Might and Magic V; it's a good skill!
The Dwarven Special Ability is second best, but it's not as good. With the Elven one, you defeat everyone faster, and you take less damage. So, it's a skill with a double effect.
The Human Special Ability is the worst; the effect is clearly too weak!