A blog post by Alistair Roberts, as curated by Steve Sailer. (Steve's version is shorter and more targeted; the original blog post is the fourth in a series on triggering and suffers for its reliance on the particular issue.)
It seems like a very useful dichotomy, and strongly reminds me of Ask and Guess.
I initially upvoted this, but I changed my mind after reading the article, which appears to me to have a very significant agenda in favor of one of the modes of discourse it outlines, over the other. This makes me extremely wary of its classification-scheme.
If only there were an adversary to argue for the other mode! :P