How does dragon compare to Grendel and his mother?

Dragons are typically portrayed as powerful, fire-breathing creatures in mythology, whereas Grendel and his mother are characters from the Old English epic poem "Beowulf" who are depicted as monstrous, humanoid figures. While dragons are often seen as the embodiment of chaos and destruction, Grendel and his mother are driven by vengeance and a desire for revenge. Both dragons and Grendel's family are formidable adversaries that heroes must overcome in tales of adventure and heroism.