It is wrong to compare PubMed and Scopus. PubMed is a free database maintained by the National Centre for Biotechnology Information (NCBI) at the US National Library of Medicine (NLM) for accessing citations from MEDLINE, journals in life sciences, and online books. It does not provide any metrics on journal quality as Scopus or WoS (Web of Science) provide.
Scopus (owned by Elsevier) is an interdisciplinary bibliographic online database launched in 2004 containing abstracts and citation database as a competitor to Web of Science (owned by Clarivate Analytics). Scopus gives four types of quality measures for each title, which are:
h-Index
CiteScore
SJR (SCImago Journal Rank)
SNIP (Source Normalized Impact per Paper.
Please note that CiteScore has been introduced by Elsevier (based on Scopus) as an alternative index to the much popular Impact Factor owned by Clarivate Analytics (based on Web of Science). Most of the journals in PubMed would be indexed in Scopus or WoB according to the criterion adopted for inclusion. As PubMed is simply a database similar to CAB Direct it will not have any quality indexes. Indian Universities backed by UGC give weightage to journals having Impact Factor or CiteScore than those without any of such quality parameters.