There is more content and syllabus on Apex. While on UC Scout you can have multiple attempts on quizzes and assignments, but on Apex you have only one. The questions tend to be harder on Apex. Apex is 50$ cheaper compared to UC Scout. Apex also has tests which are helpful for the AP exam. If you want to take one I suggest you to go with the Apex course, because for 50$ less you can get better prepared and take a rigorous course. Rest all its pretty much the same.
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