Which is more valuable bishop or horse?

Which is more valuable bishop or horse? Two bishops coordinate very well as the bishop pair because they can operate on all the squares on the board In an open position (one with few blocked pawns) the bishop pair is stronger thana bishop and a knight. So the bishop is worth a tad more than the knight.

Two bishops coordinate very well as the bishop pair because they can operate on all the squares on the board In an open position (one with few blocked pawns) the bishop pair is stronger thana bishop and a knight. So the bishop is worth a tad more than the knight.