Academic search engines are preferred over general search engines for research as they only search predefined academic journals, reviews and abstracts, ensuring higher quality results. General search engines search entire databases including irrelevant articles, have less organized results that lack standards. Academic search engines also provide advanced search options, allow determining research quality, and have specialized subdivided databases not available in general search engines.

1. GENERAL SEARCH
ENGINE
ACADEMIC SEARCH
ENGINE
The academic search engine
only searched through
predefined journals, reviews,
and abstracts
General search engine
searches from the whole of the
database that includes both
relevant and irrelevant articles
Many academic search
engines have the option for
determining the quality of the
research
Advanced search options that
are available in almost all
academic search engines
The search results of general
search engines are not
organized and lack
General search engines do not
provide the quality and
standard of results
V E R S U S
Although various search engines such as google and yahoo are
available yet researchers and manuscript writers prefer to use
academic search engines for searching references and writing
research articles. This indicates that there is a significant
difference between a general search engine and an academic
search engine.
The databases available in
academic search engines are
further subdivided into the
specialized database
A facility that is not available
in general search engines
Source
https://www.cognibrain.com/top-academic-search-engines-for-research/