So, we see even though both Grendel as well as Beowulf depict the same character of the monster Grendel, they both do them in each their different perspectives. In Macbeth, fate is so significant that it is personified by the Weird Sisters, who drive the action of the play. But then, Beowulf wasn't about Grendel.
However, the two different points of view telling the story create vastly different novels. They went out of their way to help me, and were in no way obligated to do so The monster's thoughts were as quick as his greed or his claws.
If all things are to be considered this short essay would turn into a book One of the most interesting things about both the poem as well as the novel is that they present the readers with an insight into Grendel's mind by showing us his thoughts.