From my research, the most valued digital marketing course globally appears to be the "Digital Marketing Specialization" offered by the University of Illinois through Coursera. This course, renowned for its comprehensive coverage of all aspects of digital marketing, has been praised for its practical approach and industry-relevant content. It offers a deep understanding of digital marketing concepts, including SEO, social media, and content marketing. The course's high value is also due to the prestige of the University of Illinois and the flexibility of Coursera's online learning platform. It's a fantastic course for anyone looking to break into or advance their career in the digital marketing world.