If you want to turn it into an app, ever, go with drupal. You're more familiar with WP, so use that as the default unless the "friend" can give you a list of c

If you want to turn it into an app, ever, go with drupal. You're more familiar with WP, so use that as the default unless the "friend" can give you a list of concrete reasons to go with drupal. When it all comes down to brass tacks, use what you know (especially since getting it rapidly deployed is probably more important than making sure it has a billion eCommerce modules and hooks).