Ritter for military / arms control,

Krainer for economic trends and political trends

Crooke for diplomatic matters.

Tomski for engineering

Etc.

For the rest, they each have interesting and instructive (even fascinating) personal experiences BUT beyond the above I think they are largely quoting / influencing each other, so pick and choose what are, largely, opinions, based on your own experiences and personal knowledgge

Best regards, Shyaku