The visibility of the link that will be acquired; for example, in-content or editorial links can get clicks and are prioritized by search crawlers when parsing/accessing page data.
The topical relevance of the page hosting the incoming link, since contextual links pass more value and trust.
The strength of the hosting domain and its ability to pass through high amount of value to your site; this can be measured through site metrics such as PageRank, Domain Authority, TrustRank, mozRank, traffic data, etc.
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