Change your preferences here.
Wing Attack should never be considered for competitive play since other, more powerful or more desirable moves exist. It is outclassed by several other Flying-type moves in many aspects; Brave Bird and Drill Peck possess higher Base Power, while some other moves that have the same such as Aerial Ace and Pluck are more useful than Wing Attack.
Brave Bird is a more powerful option, but it inflicts recoil damage to the user.
Drill Peck is a more powerful option.