Google Analytics is great for me. Does everything I need and so much more.
Although I use Webalyzer for "live" statistics - i.e. catching out the bots that come along and hit your site 100,000 times in 12 hours and banning them quick!
Generally I'm asked by people (buyers) to see my Awstats, so I use that. It's a handy software. Too bad I don't need half of the information it provides.