Snail Mail vs. Email

Both Zoobooks and Zootles readers have the chance to get their original artwork displayed in the Kids Zooworks section of our website--but the format in which we accept this artwork is very different for each magazine. Zoobooks readers send in their original drawings by regular mail. Zootles readers can only send computer scans via email. Do you see a benefit or hindrance in one delivery over another? Any suggestions?