There is no 'silver bullet' database that is going to work for every student, every time. It hasn't been invented yet! Over the course of your literature review you are going to need to use at least a few databases, and many, many different keywords and search terms.
The 'Essential Databases' should be of use to all students in the Social Sciences, but obviously your projects will vary. I recommend starting with the essential databases and then moving on to the subject specific databases once you really know your subject backwards and forwards.