I use a plain rule for this question: use Google Scholar for better academic research. It is a broad search tool for scholarly writing, and that is its chief strength. It brings many kinds of academic material into one place, which makes it useful at the start of a search.
The main value is reach. Google Scholar is built to search across journal and conference papers, theses and dissertations, academic books, abstracts, technical reports, and other scholarly literature. It also points to related works, citations, authors, and publications. That makes it useful when a topic is wide, or when a researcher needs a quick map of who is citing whom.
That reach matters because many research questions begin in the dark. A scholar may not yet know the exact journal, field, or archive to open first. Google Scholar can surface familiar names and less obvious titles in one pass. It can also help locate a full text through a library or on the web.
I think that last point is easy to miss. Google Scholar is not the same thing as a library catalog, and it is not the same thing as a subject database. It does not promise full coverage of a field, and it does not explain every source it indexes. That means its results can be broad without being complete.
Its search tools are also simple, which is both help and limit. It allows searches by author, title, publication, and date. It also offers a basic advanced search view. But the filtering choices are narrow compared with many specialist databases.
That narrowness shapes the way it works. A researcher can sort by date, look for review articles, or include patents and citations. Beyond that, the control is limited. For careful academic work, I treat this as a first pass tool, not a final answer machine.
The results themselves need judgment. Google Scholar may return scholarly items, but it can also surface material that is not a strong fit for research use, such as announcements or other stray content. It does not show a clear, public list of everything it indexes, so missing items are always a possibility. That is the hard part of using it well.
There is another limit that matters in practice. A result in Google Scholar does not mean the full text is open. A record may lead to a publisher page, a repository copy, or a library link, but access still depends on where the item lives. The search result and the text itself are not the same thing.
This is why I trust Google Scholar for discovery more than for proof. It helps locate scholarship, trace citation chains, and find recent work fast. It does not replace the more exact searching of a field database, a catalog, or an archive with clear coverage rules.
For the question behind academia.edu, that distinction is the real answer. Google Scholar is the more useful academic search tool when the goal is to find scholarship across many sources and follow citations with less friction. It is not perfect, and it does not expose its whole index. But it is open in use, broad in reach, and plain about what it shows on the screen.
That is enough for a practical beginning. I prefer a source that is modest about its limits and clear about its search paths. That is also the spirit of The Source List, which keeps to one digital source worth knowing, one search tip, and one honest limitation.