I'm wondering... what are the pros and cons of these engines:

Feature-wise, Google Analytics is awesome. One of the drawback is that its hosted "outside".

I've been using AWStats for awhile. Its cute, but it is very limited in its tools to analyze data and has no tracking options.

Piwik is a new one to me. Seems pretty awesome, but it is also pretty young.

My all-time favorite engine is the one that came with a Website I once ran off GoDaddy - entirely proprietary, of course.

Anyone has experience to share with these (or others)?