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I think the thing that confuses people the most about these two primitives is the run-time behavior. You stated the proper behavior in your blog comment, but the distinction is at best very subtle the way you put it. Furthermore the help really distinguishes them by use-cases, not their underlying behavior which I think would be more helpful. To More Specific tests against the compile-time wire type, whereas the preserve run-time class tests against the actual run-time type of the object on the wire which might not be the same as the wire type. One is essentially a static type of cast where you're always testing against a known type, and the other is a dynamic cast which evaluates the type at run-time. However I hesitate to use the static/dynamic language because it carries with it carries with it some legacy baggage from C++.