Romanticism? Poe. He was the first writer who lived solely off of his writing profits... which were tiny. Peanuts. He wrote some amazing things, in my opinion. I absolutely love The Raven, Annabel Lee and The Black Cat. The Rue Morgue Murders are worth a mention, too.
Now, that is a hard choice. Both were great poets. I have been very inspired to write by both. My father was a very big fan of Frost. He would read it to my mother. Something, I always thought was very sweet. Poe has written some of the best poetry ever written. There have been movies made about his poetry. I would say Poe but, Frost is a close second.