Naruto VS One Piece

One Piece is the most popular anime in Japan. I was really surprised when I came here that Naruto was more popular than One Piece. Naruto seems to be a big deal for some people here, and so am I! (^-^) The reason why One Piece is not as popular as Naruto, in my opinion, is a difference of language. Japanese has SO MANY adjectives or Japan-specific terms. I think the nuance of Japanese might not be able to be translated well.. 

This is what my mom sent to me the other day :)

I would like to buy Naruto version of those post cards when I go back to Japan!