google vs statcounter

I installed Google Analytics on Sunday night and thought I'd give it a go vs my old faithful Statcounter. Google's interface is really easy to use and much more pleasent than Statcounters. However, it appears to be giving me differnet results from Statcounter. From this week's data:On Monday Google said I had 32 visitors - Statcounter said 55On Tuesday Google said I had 42 visitors - Statcounter