What are the two major poetic Guru biographies suitable for devotional reading that are highlighted in the preface?

The preface in Chapter 0 identifies two ancient, detailed, and poetic works in Maharashtra that are particularly suitable for Parayans and Saptahs. The first is the sweet and graceful biography of Shri Samarth Sadguru Narsimha Saraswati Maharaj, written by Shri Saraswati Gangadhar, which is famously known as the Brihat or Thorale Guru Charitra. The second is the more recent, sweet, and inspirational biography of Shri Sachidanand Samarth Sadguru Sai Baba Maharaj, titled Shri Sai Satcharita, authored by the late devotee Shri Govind Raghunath alias Annasaheb Dabholkar. These are noted as being exceptionally detailed compared to other works.