A good, gripping story gets my vote over an original story every time. You can have the most original idea ever, but if you can't write deep, well defined characters, or gripping scenes, then it will still be a bad book. I have read some very simple stories where the characters are deep and the scenes engaging, that have stuck with me for years. And I have read books that should have been good, with some very good ideas and concepts, that simply fell flat on their face.