Dreamweaver is a combination of an IDE for PHP, ASP, ColdFusion and a WYSIWYG HTML/CSS editor
Id go with dreamweaver because is has the design view as well as the code view;aptana is more for developers rather than designers and developers
Dreamweaver vs aptana studio (for those who don't know coding)?
I had previously used aptana 3 for a couple days and may have come to the conclusion that it is better than dreamweaver at actual html css coding
Code Hinting with CSS in Dreamweaver 5.5