based on my very similar experience and bike, I'd go with the Campy 1x9 over the internal hub. My only experience is with the Shimano nexus, and the SRAM does look a lot better.

1x9 is lighter, reliable, cheaper, more customizable, more serviceable, and easy to remove the wheel. Internal hub is heavy, overpriced, and tough to remove the wheel. Unless you want an unnecessarily heavy drive train and never get flat tires on the rear, stick with a dérailleur.