If you think of argumentation as the primary form of intelligence, then of course philosophers, who are trained to argumentate to the highest standards, are smartest. If you think that intelligence ought to somehow affect or encompass the world outside arguments, then plainly the natural sciences and engineering are smartest -- that's what their discipline does.

If you think intelligence ought to convince people of things, then obviously rhetoricians are smartest.

And so on and so on. sniff