At the Emory open house, someone posed this exact question to a panel of admissions officers. Their answer was, “Yes, we appreciate that you took dual enrollment, but we tend to look at IB/AP classes more favorably because there is a standard curriculum, whereas college courses can differ widely from college to college. If you have a choice between AP/IB or dual credit, we would prefer you choose AP/IB. However, if AP/IB courses are not offered at your school or you have exhausted the AP/IB courses at your school, taking dual enrollment classes is considered very rigorous in context of your high school”.
I don’t know if this holds true to everywhere, but this is what the panel told the student.