The following sentence from the text best supports the inference that Beowulf is stronger and braver than the average warrior:
"I hereby renounce / sword and the shelter of the broad shield, / the heavy war-broad: hand-to-hand / is how it will be, a life-and-death / fight with the fiend."
This statement shows Beowulf's bravery and strength because he is willing to face the enemy, Grendel, in hand-to-hand combat without the protection of weapons or shields. This act demonstrates his confidence in his physical abilities and his courage, making it clear that he is exceptional compared to the average warrior who would rely on weapons and shields for protection.