Could you compare the biographical works of Shri Dasganu Maharaj and Shri Annasaheb Dabholkar as described in the preface?

Certainly. According to the preface in Chapter 0, Shri Dasganu Maharaj, a devotee graced by Shri Sai Baba, authored two short biographies. These works, found in Bhaktalilamrut and Bhaktisaramrut, are described as excellent and graceful. A key difference highlighted in the text is that Dasganu Maharaj used his biographies to beautifully depict the pitiable state of the country and its causes. In contrast, the preface explicitly states that Shri Annasaheb Dabholkar, author of Shri Sai Satcharita, did not involve himself in such socio-political commentary within his writing.