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.
This is actually a very good link, it should not be sitting at a negative score. The description of the "ARGUMENT AS SPORT" mode of intellectual discourse is especially interesting: LW has always maintained that factionalized debate does not promote good epistemic rationality, but it seems that it does have some redeeming qualities after all.
My guess is that the most rationality-conducive style actually features some kind of tensegrity of the two basic kinds of debate. The two failure modes to be averted are (1) excessive groupthink and a fixation on petty etiquette, and (2) a complete lack of shared values, leading to hyper-factionalization.
The "argument as sport" mode doesn't seem terribly factionalized, at least not in the sense of arguments as soldiers.