While I love reading AskHistorians generally, my favorite posts tend to be those that include scholarly debate. Whether something is unsettled or there are recent publications that change or even upend conventional understanding, I love to read two (or more!) conflicting approaches to a topic, backed by appropriate resources, and see how people weight different evidence for or against their positions.
What are some of the best examples you have bookmarked, covering any topic? More than just examples, have you been in one that has changed your mind, or at least opened up a new avenue to consider?
Across various threads and questions over...years, now (!), my dear /u/AnnalsPornographie and I have represented two side of the debate over the alleged "invention of privacy" in the early modern era. Here's what I think was the first iteration of it. In short, early modernists and modernists, especially scholars of sexuality, point to an invention of privacy in the early modern era. Medievalists say, "Um, hi, the Middle Ages would like a word or two."
"The Middle Ages would like a word or two" is a very sadly common response to a whole lot of "invented in the early modern era" theses. :/ Here's another good example of that, Laquerer's "one sex" theory that he tries to project backwards onto the Middle Ages with...not so good results.
I have a separate section on historiographical debates in my flair profile, seeing as my field of expertise is undergoing a pretty major paradigm shift and a lot of the things we used to believe about Greek warfare are now being questioned. My most comprehensive overview of the debate is here.
I posted a rejoinder to another flair talking about Russian war plans in the 1812 invasion here