<p>The only difference I can think of is that the ACT is very popular in the midwest whereas the SAT is popular on both coasts.</p>
<p>see <a href=“http://www.princetonreview.com/testprep/testprepimages/RedStatesBlueStates.pdf[/url]”>http://www.princetonreview.com/testprep/testprepimages/RedStatesBlueStates.pdf</a></p>
<p>As it so happens, most of the states that take the ACT aren’t well-known for their education systems, so it’s quite possible that more people who submit their ACT scores are the top students from their areas, but these top students wouldn’t necessarily be top students on the coasts.</p>
<p>No offense to the OP of course.</p>