It is a difficult question to answer. Wos and scopus, basically focus on journal articles, but do not take into account web pages Google scholar only takes into account documents posted on web, but does not value the paper. It also does not filter duplicates properly.
Given the tradition of databases, the order of preference is : wos, scopus and google scholar. Anyway, when I am asked for curriculum, and there is no standard format, I usually include all (wos, scopus and google)