Final answer:
In 'Gulliver's Travels', both a hero as a giant among Lilliputians and as a tiny figure among Brobdingnagians are effectively used for satire. They are equally effective as they alter perspectives to critique human behaviors and societal norms. The Lilliputian scenario may resonate more as an iconic metaphor for critical societal observation.
Step-by-step explanation:
In Jonathan Swift's Gulliver's Travels, both the device of a hero as a giant among Lilliputians and a hero who is tiny among Brobdingnagians serve to create an effective satire. The former exaggerates the pettiness and triviality of human concerns by showcasing them in contrast to Gulliver's size, while the latter emphasizes human vulnerability and imperfection by placing Gulliver in a land of giants. It can be argued that they are equally effective as satirical devices because they both offer an extreme alteration of perspective, which is the essence of satirical exaggeration and contrast. However, the depiction of a hero as a giant among Lilliputians is often seen as more iconic and resonates more as a metaphor for viewing one's own society from a detached and critical perspective.