We all read non-fiction, and I'm not about noticing stop signs on the road!
My preference is for history books and biographies -- yet perhaps these branches of non-fiction are closest to fiction, not least because they are a battlefield. Some texts, especially when there's sociology thrown in, may earn their authors a cancellation in the modern Western sense, and I presume they still 'cancel' historians the old way in North Korea! Exile is perhaps the most common, falling somewhere in between.
Quite a lot of popular history books -- in the West, much less than, say, in the 1930s, but here parts of the world do differ -- are designed to validate and strengthen their readers' beliefs regarding past glories of their native land and black perfidy of their neighbours.
The other pitfall is to judge the past by the standards of the present and portray it as one network of crimes stretching back in time to the ancients -- thank you ever so much, Hegel, for your 'world history is the world's court of judgement'!
The one unmistakably positive development of historical science in the last century or so has been studying the lower strata of societies in greater depth -- and not only because those works help us write historical ravishment!
And yet I'm drawn to history books and bios, pitfalls be damned! I want to try to understand what went down at the hinge points of the history -- I've mentioned to @Claire once that if the Europe of 1930 was assured that the Great War was the last military conflict of such magnitude and that disarmament was around the corner, the Europe of 1935 was busy preparing for the next one. I want to see the glimpses of many personalities I'm interested in too.
Which kinds of non-fiction do you prefer?