There are millions rationales why people choose one web stats' software over another, but for most people (not corporate or large business scale), Google Analytics will provide you with the best insight of your website. Of course in order to take benefit of advanced segments, custom reports, annotations, setting goals and make A/B and Multivariate testing, you should be reading more tutorials and even watch webinars online or YouTube videos. Until you get a grasp on all the new aspects in Google Analytics.
It takes practice, until you get the hang of it, but believe me that after 1 month, you will be the king of the class in everything related to Google Analytics. Professional web analytics consultants have a lot of knowledge about Internet Marketing as a whole and not just data analysis software. Google Analytics is just a tool, and you need to understand what the numbers mean, follow visitor behavior and make a conclusion upon your wish to change your marketing strategies.
If you don't give yourself to learn more, you will stay at the back at the end. Knowledge is everything on the Internet. If you have tough competition, analyzing Google Analytics tracking code' data, will surly help your business optimization strategies and help you learn more BI skills.