In kidney transplantation, which kidney lasts longer: living related or living unrelated? or both will have same effect?

Living related: Both kidneys do well because they are living i.e. Are transferred from donor to recipient fresh. There is no downtime like in the case of the cadaveric kidney where the recipient is called after the kidney becomes available. Accordingly that kidney waits out of body for sometime. The living related has a better chance of match than living unrelated, however.

Depends: Because there are effective anti-rejection medications, there is not a significant difference between the two groups. Even if a kidney donor is a blood relative, the degree of genetic match (HLA type) can vary and unless you have a "perfectly matched" kidney (i.e. zero-antigen mismatched kidney), most living donor kidneys (of the similar age groups) are thought to be similar in quality.