Doesn't matter. Both will work equally well.

All of your edits made in ACR will be stored in the DNG (as metadata; the original image data is not touched).

It doesn't matter what edits you made, however, since those edits aren't taken into account when the PE builds a profile from the Chart Wizard.

See here for more info, under "Apply Camera Raw Adjustments"

<http://labs.adobe.com/wiki/index.php/DNG_Profiles>:Editor#options_menu