B. The Story-driven Bibliomemoir: This type includes a specific story that unfolds even as we learn about the author’s reading life. The story is usually set in a larger historical/cultural/social context – personal or collective - with a strong narrative structure. Story, for this purpose, is defined as a narrative with a beginning, middle, and an end.
A. The Objective-driven Bibliomemoir: Books in this category are focused on either entertaining or educating, for the most part. For example, reading and exploring particular book(s) or author(s) by design, sharing how-to-read approaches, etc. Ben Yagoda, in his 'Memoir: A History', refers to these as "shtick lit": books perpetrated by people who undertook an unusual project with the express purpose of writing about it. A rather unfair derogatory dismissal because there are some very well-written books on this list for all bibliophiles.
The compulsion to express that intense, mysterious and existential experience of certain books in words is no different from, say, a painter's compulsion to capture a particularly-moving scene and express/interpret it on canvas. And, secondly, for these bibliomemoirists, the books they love are not an alternative to life. Rather, such books, by virtue of opening up the real world in new and different ways, are significant life events and milestones in themselves.