Half a dozen of one and 6 of the other... I think a strutter might elicit a stronger reaction at times, but sometimes it is not the reaction you want! Sometimes it will make em' run in, and sometimes it will make em' run away...
My biggest advice on the decoys is if the boy is right-handed put the decoys to his left (easier to swing and shoot to the left for a right-handed shooter), and make sure you are sitting to his right (the non-shooter should sit to the right of a right-handed shooter and to the left of a left-handed shooter).