What is more important: luck or fighting spirit?

Dude, you probably confused morale with luck, then your statement will be correct.;)

Dude, you probably don't quite understand what "double damage" means... ;) The problem is that the game tooltip doesn't explain this term, and many people misunderstand it.

The thing is, when Luck triggers, it doesn't double the final damage, but only adds the base damage to the total (i.e., doubles the base damage). And the base damage usually makes up only a small part of the overall damage.

Imagine: a Knight of Darkness (with its ability to deal double damage) attacks with luck. Now imagine how much damage it will do? Quadruple! I remember something like that happening. It was fun. Those who were attacked by knights (I don't remember who their victims were) fell from just one such hit.

This is simply a common misconception. Let me give an example - a Death Knight controlled by a hero with 40 Attack units hits some Centaur. Suppose the Knight has the "Double Damage" skill activated, as well as luck in the same round. Calculation of the final damage he deals to the Centaur looks approximately like this:

20 HP (base damage, it can be between 15-30 HP) + 55 HP (the difference between the Knight's attack and the Centaur's defense) + 20 HP (we add base damage due to the Knight's skill) + 20 HP (Luck also added base damage) = 115 HP. Of these, luck and the skill brought only 17% of the damage each. So where is the quadruple damage?

And if morale triggers, you can deal another 20 HP (base) + 55 HP (the difference between the Knight's attack and the Centaur's defense) = 75 HP, which is much more effective than luck, which only brought 20 HP. That is, in the case of morale triggering, on average, you can inflict about the same amount of damage again. (I say "on average" because sometimes it's less, and sometimes more). In the case of luck - only its part is added...

This is why I think that sometimes it is worth listening to other players, instead of making unsubstantiated statements... Reiter said everything correctly.