If you are regularly updating th blogs it will be more beneficial for your site than an article, since it has the same old content and search engine loves to show something new, informative and most appropriate to its users.
Articles are a one time process but blogs are regular. Blogs are used to publish your thoughts on the web. It requires you to continue till the end. you can archive the older one but it will be still there for your subscribers and will be on web. you can update it and your subscribers will automatically updated with the fresh content without accessing it again. Also any updation do not lift your blog from the web.
But in articles you have only one option among two, either remove it or leave it as it is. if you will modify it, it will be lost for some time till approval and hence you will loose the PR (if your article have some). you can not archieve it. One article can describe only one topic but one blog can be used to describe so many topics.
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