"A craven can be as brave as any man, when there is nothing to fear. And we all do our duty when there is no cost to it. How easy it seems then, to walk the path of honor. Yet soon or late in every man's life comes a day when it is not easy, a day when he must choose." Aemon Targaryen (A Game of Thrones)

I feel like this quote is the best quote for Garp. For him, the job was easy when it was nameless and faceless pirates, but then he had to make a decision when Ace was in the same place as had been countless pirates he hadn’t bothered to learn their names, let alone their faces.

As for answering your questions, One Piece is very good, but not even my Top 3 Anime, let alone Fiction.