Quote Originally Posted by john_s View Post
Example: Fujifilm's recommendation for Neopan400, 35mm, 400 speed, Xtol 20degC, small tank, intermittent agitation: 6.25min

From Kodak's pdf for Xtol: same conditions: 8.25min

Perhaps Kodak wanted people to say the Neopan400 isn't any good because highlights blow out or something like that.
Or, they think more mid-tone and highlight contrast is a technically better negative. I often find that I get more interesting tonality with a negative that's developed a bit longer.
How you develop your negative also depends on how you print them. You can measure differences in film curves all you want, but if it doesn't suit the paper you print on, or the paper developer you use, then none of that is worth anything. Same idea, but a different target.