Differentiate between spermatid and spermatozoa?

Following are the differences between spermatid and sperm:
 

Spermatid	Sperm
Formed by the process of spermatogenesis	Formed by the process of spermiogenesis
Immature sperm that undergoes spermiogenesis to form mature sperm	Mature sperm formed from spermatozoa
Not divided into head, neck and middle piece	Well differentiated into distinct parts