Both are good when the content is fresh and most relevant to the backlink web page. For example: this page has SEO article and forum related content . If I get a backlink and that back link target to the article or forum related, it's good for the site. If the promoter gives a backlink to real estate company. It's not credited.
Sometimes articles submitting in many websites (duplicate content). It's not good and possible to decrease SEO rankings. SO fresh content with most relevant link is important rather than forum or articles.