Agree with what everyone is saying: every feat of Shazam's was either with utter ease (catching the bus, super speed, lightning blasts, etc.) or against an exactly equal peer (Sivana powered by the 7 deadly sins), but we don't see him perform a feat on par with Thor busting open the neutron star forge, Reeves moving the moon, Captain Marvel destroying Ronan's armada, or something likewise. Something that shows off his herald-level status.
Till then, Hemsworth has too much to pull from. Thor wins.