I haven’t used it in anger yet, but I think Semantic Scholar only searches databases that give you free access to the PDFs—so if you want to know you’ll actually be able to click through and read the article, that’s an advantage over Google Scholar, which will bring citations which are paywalled or unavailable online as results.
I believe also only searches (fairly) respectable databases like ArXiv and PubMed Central, so you are less likely to get poor-quality results.
I haven’t used it in anger yet, but I think Semantic Scholar only searches databases that give you free access to the PDFs—so if you want to know you’ll actually be able to click through and read the article, that’s an advantage over Google Scholar, which will bring citations which are paywalled or unavailable online as results.
I believe also only searches (fairly) respectable databases like ArXiv and PubMed Central, so you are less likely to get poor-quality results.