Mufti Taqi Usmani writes:
During my time as a student, I had the opportunity to read numerous books on the methodological differences between the scholars of Deoband and the scholars of Bareli. The reality of the matter with respect to the strong objections that were raised by the scholars of Bareli against some writings of the senior scholars of Deoband (may Allah have mercy on them) was clarified by many respected personalities. However, the book that impressed me most on this subject was Hazrat Mawlana Manzur Nu‘mani Sahib’s (may Allah have mercy on him) book Fayslah Kun Munazarah. The truth is that after reading the evidenced, engaging and firm way in which Hazrat Mawlana clarified these writings, the slightest doubt cannot remain in the heart of any fair-minded person about the beliefs of those elders.
Although the name of the book is Fayslah Kun Munazarah, from which one may get the impression that it is a typical polemical book, and it is our misfortune that we have the impression of “debates” (munazarah) that it is a term used for a public arena in which two headstrong “wrestlers” each seize every opportunity to bring down the other in every just and unjust [rhetorical] battle, and behind these opportunities, the urge to seek the truth is left behind and suppressed; but the reality is that this book of Mawlana is far afield from this type of polemical ground. Rather, in reading it, one comes to know what a good-intentioned debate is.
In its origin “munazarah” is a word from the Arabic language, the meaning of which is “to collectively ponder over a particular issue.” In this book, Mawlana presents a practical demonstration of this reality of “munazarah.” His style and method is not the style of a typical debate. It is in a sincere, positive, objective and evidenced form of writing, the objective of which is to provide understanding, not to debase and humiliate the opposition. (Nuqush-e-Raftegan, pp. 395 – 6)
Read a translation of Fayslah Kun Munazarah here: https://barelwism.files.wordpress.com/2019/01/decisive-debate.pdf