GraphQL/Gatsby/Prismic - difference between 'edges.node.data' and 'nodes.data' in query

I'm following this tutorial on Medium to get Gatsby working with Prismic.

In the GraphiQL explorer, the two queries below both yield the same result and was wondering when I should use one over the other (i.e. edges.node.data vs nodes.data):

Query #1:

query Articles {
  articles: allPrismicArticle {
    edges {
      node {
        data {
          title {
            text
          }
          image {
            url
          }
          paragraph {
            html
          }
        }
      }
    }
  }
}

Query #2:

query Articles {
  articles: allPrismicArticle {
    nodes {
      data {
        title {
          text
        }
        image {
          url
        }
        paragraph {
          html
        }
      }
    }
  }
}