Good knight, bad bishop
Most of the time, the bishop is superior to the knight by 0.25 points (or so!)
However, this is a very superficial statement that does not apply to all positions. Sometimes the knight has the last laugh:
White should play 1.d5! which permanently wins the light squares as Black can not advantageously play ...c6
As Ih8sens pointed out, 1...e4!? is a great attempt at counterplay - though of course White preserves an advantage.