I've done quite a few courses in both Coursera and EdX. I've found the edX ones quite a bit more challenging and would call them intermediate/senior level whereas the ones on Coursera a bit more introductory.
Of course this is likely dependent on what you're taking. The edX ones are in Energy Engineering and the Coursera ones have been in Wind Energy, Roman/Greek Mythology, and Macrofinances (Wealth of Nations etc.).
I'd search both for courses that interest you and definitely try both platforms.
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