When writing an article, you should aim to create a coherent and well-organized piece. Your article should be easy to read, with a clear structure that allows the reader to follow your argument. When writing a blog, however, you are free to write in a more informal style. This means that your article may be shorter and less organized than an article written for publication.
However, your blog should still have a clear structure, and it should be easy for readers to follow your argument. If you want to write an article that is both informal and structured, try writing in a hybrid style.