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Scopus vs Web of Science: which one matters?
Both matter, and which matters more depends entirely on who is judging you. Scopus (Elsevier) covers about 28,000 active peer-reviewed journals; Web of Science (Clarivate) covers about 22,643. Coverage overlaps heavily but not completely. Some journals are indexed in one but not the other, which can matter for tenure files, grant applications, and university rankings.
Detail
The publishers
Scopus is owned by Elsevier. Web of Science is owned by Clarivate. Both are commercial databases, both charge for institutional access, and both compete for the same customer base.
Different curation, different results
Scopus indexes 43,000 source titles across 334 disciplines. Web of Science indexes about 22,643 journals across 254 categories. Scopus is broader; Web of Science is narrower and (historically) more Western.
Which produces which metric
Web of Science produces the Journal Impact Factor (JCR release, June each year). Scopus produces CiteScore (June each year), plus SNIP and SJR. If someone says 'the impact factor', they mean Web of Science's JIF.
Practical rule
If your journal is in both — you're safe. If only in one — check which one your target committee (funder, university, ministry) requires. Chinese and Middle Eastern institutions often prefer Scopus. Traditional US/UK universities often require Web of Science.
The regional gap is closing
The 2026 JCR release added 521 first-time journals, 58% of them outside the US and Western Europe. Web of Science is expanding, but Scopus remains broader.