As someone who read Peterson first (and, in particular, Maps of Meaning), then Jung, I always found it interesting to see how Peterson has developed Jung's ideas.

Jung is brilliant, but also revolutionary. A lot of his ideas are very rough (to use an imperfect term) and benefit from further analysis and clarification. Sometimes this was possible with his contemporaries (Man and His Symbols, which I reference in the body of the post), and sometimes it has benefited from the work of later scholars like Campbell, Pearson, and Peterson.