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Depends how do you want the ventilation air be introduced to the zone:

• The ZoneVentilation:DesignFlowRate object allow you to directly add the ventilation air to the thermal zone, same with solar, envelope, equipment, lights, etc. This would be the way to go if you are trying to model natural ventilation.
• The DesignSpecification:OutdoorAir object would introduce the ventilation through the Ideal Loads Air System (HVAC), the ventilation air would be treated by the HVAC before getting into the thermal zone.

Depends how do you want the ventilation air be introduced to the zone:

• The ZoneVentilation:DesignFlowRate object allow allows you to directly add the ventilation air to the thermal zone, same with solar, envelope, equipment, lights, etc. zone. This would be the way to go if you are trying to model natural ventilation.
• The DesignSpecification:OutdoorAir object would introduce the ventilation through the Ideal Loads Air System (HVAC), the ventilation air would be treated by the HVAC before getting into the thermal zone.