Which analysis is best, one that has access to truth or one that has access to quasi-truth?
Not clear, says someone who should know.
What is the value of inside information? One has to separate inside facts from inside analysis. There are also ways of doing analysis that do not involve understanding everyone's emotions or 'personal opinions', to the extent that those are classified.
I don't know any effort to figure out whether inside or outside methods are superior, however.