Now site advisor does much TV advertising stating they verify REVIEWS, how do they verify? When they advertise on TV frequently, there is a reason, who is paying for that us the consumer. I still had no success finding a quality business from SITE ADVISOR, and I find costs is higher.
Siteadvisor is run by McAfee and has an objective similar to Sitejabber, namely to warn netizens about websites that may be unsavory. The difference is that Siteadvisor relies more on automated tools to analyze a site's links and downloads. This is useful, but of limited scope. It's good at spotting phishing sites and browser exploits, but I was surprised to discover that it gave the OK to sites that faked McAfee's own trust seals. They supplement this with user reviews, but don't have as active and helpful a community as Sitejabber. Siteadvisor (correctly) tells you that you won't get a virus from visiting a penny auction site, but if you want a detailed explanation why you won't get a $5 iPod from them either, head to Sitejabber. There are user submitted reviews, that can address other complaints including "bad shopping experience", but these should be treated with caution too. Their only user review of Sitejabber calls us a phishing scam (I think that reviewer confused us with someone else).
My advice: use both. Siteadvisor's uniform analysis is better for the technical questions. Sitejabber's helpful community is better for consumer advocacy and support. Differing methods give greater confidence. If both agree that a site is good, it probably is. If both agree that a site is bad, it definitely is. Otherwise investigate how each site reached their differing conclusions.