CR.NET is for programmers who use MS Visual Studio Professional. It lets you incorporate reports into your applications. This can be a Windows application or an internet application. You can distribute the application to the end user and they can use it to view your reports. 

I can't answer that question. They are two different markets. Plus, you should only do what you enjoy doing. If you like to write software, then do CR.NET so that you can build applications that have reports. If you don't like programming, but like business analysis, then just do CR so that you only work with the underlying data.