Here are some reasons why you should use google analytics:
1. Can be exported to excel easily
2. It has internal search statistics
3. Realtime updates (but still in beta)
4. Google Adwords Integration (adsense)
5. You can track loyalty if your visitors
6. Customized reporting (as based on what you want to appear in)
7. There is a PDF Export
8. Report Finder (you can search your data reports)
9. Bounce rate (this means you know how long visitors stays)
10. The Price is FREE ($ 0.00)
Thanks!