What is the best link? A link from a government site or from a high trafficked blog? Is it better to get a link from a highly relevant site or from a site with a lot of social media activity?
The dirty secret no-one wants to tell you about link building is there is no single best kind of link. If this weren’t the case, Google wouldn’t work. Everyone would go out and find a way to spam their way to the top of the rankings very quickly. Having thousands of one type of link pointing to a page is suspicious and a clear sign the site owner is gaming the system. That said, as a rule, you should try to build links on authoritative, relevant and high-quality sites. High-quality, relevant links are much stronger than links from low-quality, unrelated sites.