I would say if you are showing the charts in your web-apps that means lot to the end user e.g. analytics data. It is one of the important aspect of application

I would say if you are showing the charts in your web-apps that means lot to the end user e.g. analytics data. It is one of the important aspect of application and that decides whether people like it or not. In such case it would be good to have in-house expertize on charts/some library e.g. JFreeChart for java or Flot(JQuery) JavaScript << good for minimal charting capability>>. That helps to keep control and plan ahead. I mean same applies for google charts too. But in that case you are loosing out control over some part of your application as you are delegating this important task to third party(google). If it is part of product/portal; I think lot of clients wont approve such decision.They will prefere custom-build/coded part for that in the application.