<p>My d submitted both and did very well in the admissions process. Don't sweat it. (Although if you do significantly better on one than the other, you might want to submit just one. And no, it doesn't matter which one, regardless of what area of the country you or your schools are in.)</p>
<p>Plenty of people take both, so don't worry about it. And the ACT score report is separate, so they won't see your ACT score unless you specifically send it. I like ACT better because you can choose which ACT score to send, rather than letting the schools see all of them! So go for it.</p>