Perhaps on pedagogy, or at least nice, intuitive, layperson (but technically accurate) explanations of things. And plenty of fully-rigorous explanations of some things too.

I'm a big fan of Sanderson.

But I don't think we can compare Sanderson to Feynman on raw intelligence or contributions to the state of the art in math/science.

And Feynman himself was characterized by his advisor in a recommendation letter as "another Dirac, but this time human."[0]

[0] paraphrasing from memory, might have been a different supervisory figure.