Can you explain the different motivations for studying a Guru's biography and which is considered superior?

As detailed in Chapter 0, the study of Guru biography texts can be approached in two ways: with desire (Kamya) or with a selfless mind (Nishkam). The 'Kamya' approach is undertaken for worldly prosperity or for the removal of worries, calamities, distress, and diseases. The 'Nishkam' approach is pursued for a higher spiritual goal: liberation from the world and freedom from the cycle of birth and death. The text explicitly states that Nishkam Guru service, being selfless, will always be considered superior, regardless of the specific type of service being performed.