The main difference between digital PR and SEO link building is the focus on earned media. Digital PR focuses on obtaining media coverage from highly trafficked websites to attract referral visits. On the other hand, SEO link building focuses on earning links from websites that will help improve your search engine performance. This can be done through guest blogging, creating infographics, or developing other types of content that website owners will want to link to. As a result, digital PR is often better suited for building brand awareness, while link building is more effective for improving search engine rankings.