its situational, it really depends on the position
Better
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@1
BB > BN > NN
Two bishops complement each other: one covers the light squares, the other the dark squares.
Two knights often stand in each other's way.
A bishop generally dominates a knight.
A clear way to appreciate this is to study the basic checkmates:
KBB vs. K (easy), KBN vs. K (harder), KNN vs. KP (very hard).
It's better to have a bishop and a knight or 2 knights?