Male accessory ducts major function can be considered as these ducts store and transport sperms from the testis to the outside through urethra and consists of 
Rete testis , Vasa efferentia , Epididymis , Vasa deferntia , 
 Where as 
  Male accessory ducts major function is to produce Seminal plasma in turn which consists of many enzymes , fructose , calcium,citric acid,prostaglandins etc and consists of 
Seminal vesicles , Seminal plasma , Prostate gland and a pair of Cowper's gland.