I think it comes down to how familiar you are with ExpressionWeb and Dreamweaver. My preference is DW since I have used every version of it since its very first Macromedia version.
I have not had a lot of experience with ExpressionWeb though. But I have heard good things. I think currently DW is better even if based simply on the number of users available to help with questions you may have and products available for it.
But really it comes down to personal preference. I don't think anyone can really tell you which is better for 'you'.