I'm wondering if it makes sense to always go with a player's preferred Duty? For example Hamsik has a preferred setting of Defend even though he is an attacking midfielder. Do I really want him set to Defend even at home to a weak team?

Also, if I'm playing away to Man Utd does it make sense to set my wingers to Attack? What I'm wondering in this case is... does setting say a winger to Attack duty mean he is neglecting his defence duties during the match?

The key question really is this... is it more important to set the duty to suit the match you are playing i.e. your opponent, or is it more important to set the duty to what the player prefers?