Inspiring leader vs Legendary 2 hand

[Marlax]

so 40% bonus xp too up too 5 units in battle will help you replenish your front line troops if your a infantry man.
but how much is -1 moral on enemies troops? is -1 moral something that will drasticly help you turn the battle?

 

[COOMER]

It may becoome your salvation in a big battle.
But I'd take the 40%.