Credibility of non-journal online publications
One problem with the blog and the website is the quality assurance. A peer-reviewed article guarantees that your research at least meet the quality of that specific journal. Of course some issues exist with the peer-review system but at the moment it is the common way. Everyone can open a blog and popularity does not imply good research. I would suggest submitting the work to a regular journal, and write a shorter blog entry for communication and discussion.