Answer:
Poe’s description is more grand and worldly than Byron’s.
Explanation:
While Byron's description illustrates commonplaces in blason-like poems (blason is a poetical form celebrating a woman) with lots of light comparisons and cliche elements, Poe's treatment of a woman is more glorious. We see that in the number of references to the Classical World:
Helen, thy beauty is to me Like those Nicean barks of yore
- he compares her beauty to the Nicean barks (Nicaea was an Ancient Greek city) of yore, of long before
thy classic face, Thy Naiad airs have brought me home To the glory that was Greece And the grandeur that was Rome.
- her classic face, meaning beautiful, noble
- Thy Naiad airs refers to the water nymphs in Greek mythology, insisting on her godly figure
- the mention of Greece and Rome refer to the grandeur of the Classic civilizations, considered the beginning of all that is beauty, art and value.
The poet compares the glorious existence of a woman with everything that is considered esthetic authority. Her appeal reminds him of the subliminal classical ideal, he describes her grace as comparable to that of Ancient goddesses.
