Some of Kodak's instruction documents are old and could do with some updating. But recent ones, for example the Xtol pdf, have lots of info about other manufacturers products. Some of it looks very interpolated, extrapolated and normalized, though.

I'm not sure about Ilford's approach to film speed. I normally expose Tri-X at 200 and HP5+ at 200, so it's six of one and half a dozen of the other if you ask me.

I do agree that Ilford's lists of strengths (and implied deficiencies) of a range of developers is excellent. With other manufacturers' info you need to read between the lines to get similar information.