I completed one of both (the Mousters and Ducktorate hang on my fridge) and enjoyed them greatly. With that said, neither are listed on my resume, they have never come up in an interview and neither gave me an advantage as far as my Disney career goes.
I learned a great deal from the classes and use that knowledge to talk more intellegently about the company; but outside of the actual program, no one knows what the classes are, how they are classified, or which ones get credit.
Take the classes you're interested in and have topics that you want to learn more about.