No database can be rated as the best one to use. A more effective approach is to repeat your search across them all. When you start seeing the same records on each database you will have used each one effectively
Collection of International polar databases but only one user allowed at a time.
Scopus database is great source of high quality peer-reviewed Science and Social Science journal articles and to a lesser extent other types of sources.
Keenious is an exciting new research tool that uses Artificial Intelligence to analyse your writing and find relevant sources for you and is used as an add-on for either MS Word or Google Docs
Google Scholar and Dimensions are free online databases that are very broad. Google scholar has full-text links to UC paid sources if you add UC as a Library link in the settings. Dimensions does not have full-text links to UC content but, like Google Scholar, it will link to content freely available online. If you find something you want to read in Dimensions that has no full-text link, you can always search for it in the Library's MultiSearch or Google Scholar to see if we have paid full-text access to it.