I would like to know the difference between the different indexing, which are used in differentiating the journals, which are more beneficial to publish and why?
Ramashis - in my mind they are simply different software repositories that find and store published article information. It's not about impact - it's more about how their individual repositories differs in terms of 'types of articles', media formats etc. Some are more conservative than others i.e. ISI (Clarivate) versus Scopus (SCImago). So, for instance, most researcher's individuals impact scores will be less in Clarivate than in SCImago. That said, some employing institutions will only look at your Clarivate score as what they consider to be the most conservative and 'representative'. If you are more interested in the greatest 'general' impact - my choice on your list would be Scopus. Higher general impact again is Google Scholar.
Clarivate Analytics and Scopus are indexes. They don`t publish articles; they index journals in which articles are published. Both indexes are highly selective and apply strict criteria. Science Citation Index (SCI) is a journal search in the Master Journal List in Clarivate Analytics.
The Emerging Sources Citation Index (ESCI) was launched in late 2015 by Thomson Reuters as a new database in Web of Science. Since 2017 the index has been produced by Clarivate Analytics. ESCI indicates the possibility of a future listing in SCIE or SSCI.