Scimago (Scopus) or Journal Citations Report? Which one is more important? I am aware that Scrimago and JCR are both authoritative sources. It seems that Scrimajo includes more journals.
I was wondering which one of them is more widely used and more important?
JCR is easily the gold standard. It's the one that is used to calculate the impact factor, after all.
A heuristic is, the fewer journals are indexed, the more exclusive the index, and therefore the more prestigious.