Both spermatogenesis and oogenesis occurs in the
gonads (resproductive organs).
Both these processes involves meiosis.
Both these processes produce haploid gametes
(containing 23 chromosomes).
Differences :
Spermatogenesis leads to production of 4 functional
sperms while oogensis leads to production of 1
functional ovum and three non-functional polar
bodies.
Sperms are fully matured before fertilization
while seconday oocyte produce by oogensis completes its
meiosis II only when it gets fertilized.
Spermatogenesis is a lifelong process in males
while in females, oogensis stops at menopause (age
of 45 to 50 years).