Difference between static and dynamic text?

What is the major differences between Static and Dynamic text? I know that Dynamic text allows you too, select an instance name which later can be used when actionscripting. But I personally feel when using dynamic text that the overall look of the text is different from static text, why is this? and can this be changed or altered? as I personally feel that this text looks to rough and does not give a proffesional look to your completed project.

Cheers

Craig