Selecting the best or most appropriate finding aid for identifying sources depends almost entirely on the context of your research assignment. There is no single database or web search interface that will work for every research context; instead, you'll need to match your specific research needs to a variety of options.
Library catalog searches (i.e., Primo) can be the better choice when you are seeking in-depth, book-length treatments of a topic.
Multidisciplinary databases (i.e., JSTOR) cover a wide variety of subject areas and may include a mix of popular and scholarly sources. They can be the most appropriate choice when you just want to get a sense of what's available on a topic and when it isn't so important that you pay attention to disciplinary lenses.
Subject databases (i.e., MLA International Bibliography) cover a specific discipline and provide the widest range of access to scholarly sources. They are used for in-depth research. Which subject databases you search will be determined by who may be writing about your topic. Recommended subject databases for each discipline can be found on the "articles" page in each library subject guide.
[draft]
The databases listed below are examples of multidisciplinary databases that contain work from a wide range of academic perspectives.
An interdisciplinary journal archive. It includes archives of over one thousand leading academic journals across the humanities, social sciences, and sciences, as well as select monographs and other materials valuable for academic work. Includes the Artstor image collections.