It depends on your teams own strengths and weaknesses. The manual gives u a good idea of how the different offences and defences work. For example your opponent might have a offense with an inside focus and because your inside players arn't as strong u think u need some help. In that case u could use 2-3 zone which helps inside. Using the same example if your inside defense is strong u might decide to use 3-2 zone or man to man to help stop the ball geting inside So as i said it really depends on your players .