BudURL tracks a differently that Google Analytics. BudURL tracks closer to the way Google AdWords works. Google Analytics tracks visitors whereas BudURL tracks clicks or impressions. If a single visitor clicks on your link or site 5 times they will only be counted as one visitor with Google Analytics if within 30 minutes. BudURL will record 5 individual clicks. However, with our paid plans we do track unique IPs which is closer to what you would expect with Google Analytics and would be the best way to make a comparison with Google Analytics. But this still may not be completely accurate comparision because of how Google manages visitor sessions and other factors that come into play there.  Here is a Google Help Page that explains the difference between clicks and visitors for their tools.

http://budurl.com/x3sg