May be Dreamweaver CS3 is not the best choice to develop ASP.NET pages with code behind, was great for ASP web pages, does not have a debugger like VS, but you are closer to the code, you will create excellent web pages with both, it depends of your programming skills, whatever, i like to use Dreamweaver CS3, sometimes VWD may be too complex for easy solutions.
if u prefer VWD go http://www.microsoft.com/express/vwd/ and You can compare yourself
Just Give It a Chance to DW CS3
Ronald Avendaño
ronald.avendano@gmail.com