How do spermatogenesis and oogenesis differ in terms of the number of gametes they produce?

In spermatogenesis the sex cell divides (from 46 chromos to 23), and then divides again to produce 4 haploid cells that become sperm. In oogenesis, the sex cell divides into one ovum and a polar body in the first division, and in the second division the ovum divides again into a haploid (ovum) and a polar body, and the polar body divides into two more polar bodies. Polar bodies are non-functional, so only one ovum is produced in the end. Spermatogenesis produces millions of sperm, while oogenesis only produces one mature ovum a month.