In a comic, I've always been under the impression that those are all the same thing, despite people talking about them as if they are separate.
In a comic, the "story" is not only in what is written, but how it is conveyed, and it is more than likely conveyed through the art. Same with characters, who can be written to have certain traits, but it is through the art and story that the depth that draws in the reader is to be found.
Additionally, a comic that is all art with no story or character just becomes pretty, unrelated pictures, which wouldn't really hold the reader's attention.
Comics are a "Sequential Art." A single piece of art that is constructed from the interplay of these three elements, and probably a few others. Even if the art is not the most detailed, or if it does not meet the reader's standards, I would argue that more often than not, the art cannot be separated from the story or the characters.
So really, I would rank them all as one, because if there is any failing in one or more, the story will eventually lose my interest.