Yeah, this thread's title is self-explanatory and self-evident: intellectual diversity is greater than all other types of diversity combined.
When I was a uni student I noticed posters that were put up all over my uni. They said embrace diversity, with the context clearly being cultural and racial.
Obviously there's nothing wrong with people coming from different backgrounds and I said this to my colleagues.
But what's better than all that is intellectual diversity. I said to my colleagues that, as uni students, we should discuss and evaluate diversity rather than blindly embrace it.
I wish I'd have added that intellectual diversity trumps all other kinds.