The main reason Google is lower is because Google doesn't include visits from known SearchBots/Crawlers in it's general traffic reports. This is huge when it comes to sales forecasting.
Statcounter software would have to know the IP addresses of every Spider, pinger, and crawler currently surfing the web. I assume there's 1000's.
So in many statcounter software packages, a number of Website Crawlers are overlooked and not filtered from the general traffic reports.
To verify this, check the recorded IP's of some of your visitors. Copy and paste the hostname or url into google/yahoo/msn and do a search. You will find many of your visitors are Telecommunications providers, domain registries, and WebsiteCrawlers.
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Jacksonville website design - Websites and web systems