If you are not technical in the slightest, then stick the JetPack for now. This provides you with the basic information you need to see whether your website is a success or not.
If you are a little more technical, take a look at Mint. This provides you with all the essential data you will need on a very easy to use interface.
If you don’t mind digging around a bit to familiarise yourself, check out Google Analytics – This is a robust platform that will have almost every feature you could ask for from an analytics tool.