How much you delegate to employees depends largely on how much uncertainty the person can handle (see Delegation Poker). 

But it also depends very much on the situation. If you ask yourself in which situations which leadership styles are most effective, an interesting pattern emerges:

SituationCharacterManagement style
SimpleQuickly manageable, linear, clear
--> Best Practice
Rather deep poker cards, rather "directive" best practice
ComplicatedUnderstandable with enough time
--> Good Practice
Play poker as high as possible. Empower, integrate, delegate.
ComplexAfter two weeks of analysis, I understand what it would have taken a fortnight ago...
--> Emergent Practice
Play poker as high as possible. Take away unnecessary security, endure necessary security.
ChaoticEvents come thick and fast
--> Novel Practice
Deep poker cards. Clear announcements!

This might also interest you: