Which comparison of Beowulf and Grendel is most accurate?

In the poem Beowulf, Grendel is presented mainly as a terrifying, murderous monster and an enemy of the Danes. John Gardner’s novel Grendel retells events from Grendel’s point of view, giving him thoughts, doubts, and complicated feelings. So the most accurate comparison is that the poem portrays him as heartless, while the novel makes him emotionally complex.

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