I choose wisdom.
I don't pick power for absolute power corrupts. Look at Ganon for example.
I don't pick courage for courage is useless when you rush into something unprepared.
Wisdom is the best choice for it is hardest to obtain.
"By three methods we may learn wisdom: First, by reflection, which is noblest; Second, by imitation, which is easiest; and third by experience, which is the bitterest."
------Confucius
With Wisdom one will gain both Power and Courage at one time thus eliminating two birds with one stone. And it takes longest to obtain Wisdom the natural way. Wisdom is not knowledge but something more powerful because Wisdom dictates how you use your knowledge, Power, and Courage. I am inpatient and wish to achieve great Wisdom now.