Hill's issue at BYU was that he couldn't stay healthy. That really stunted his growth as a QB. He looked incredible in the Nebraska game before his season ending injury, according the Steve Young.
I think there is a good chance that Hill > Doman. Young said multiple times that Hill is a bigger, faster, stronger version of himself. Put Hill and Luke Staley in the same backfield? That would be crazy good. But you can't argue with Doman's 12-2 season. He also gets street cred for beating Utah and sending Lavell out a winner.
I hope Hill's potential plays out even better in the NFL, like Young. We should find out this year.