Although Beast is apparently stronger and more dexterous, Werewolf may have a slight advantage in endurance. Werewolf certainly is much harder to hurt (damaged/killed by silver items) and also has advanced regeneration capabilities.
Finally Werewolf has significant claws and a bite that can damage materials as durable as concrete.
If the fight is out in the open with little impact from the environment, Werewolf for the win.
If Beast can use the surrounding to his advantage and locate some silver, then he has more of a chance.