The first game for Benin ended in a 2:2 draw against Ghana. It should be considered as a decent result. Meanwhile, Guinea-Bissau has lost 2:0 in a game against Cameroon.
Even though these two results do not tell the whole story, Benin should still have an edge. In their last five games, Guinea has won only 1 game, drawing 2 and losing 2. Meanwhile, before their opener against Ghana, Benin has won 3 previous games.
The way that both of them have performed before the competition show that Benin are considered favorites for a reason.