What are the core differences between the paths of Shreya and Preya as described in Chapter 17?

Chapter 17 of the Sai Satcharitra presents Shreya and Preya as two paths with opposite natures, like light and darkness. Shreya is defined as the path of the Good or Salvation, representing pure Knowledge (Vidya) and discrimination. In stark contrast, Preya is the path of the Pleasant or worldly joy, which is characterized as pure Ignorance (Avidya) and a lack of discrimination. The text clarifies that those who are drawn to Preya fall away from their true self-interest, while the wise are never deluded by it.