Articcle Builder at its heart is a tool that provides you with ready prepared, finished content. You can do lots of fun stuff with the other tools in the toolbox.
IAW helps you to prepare content, you get to put it all together.
So, if I want 20 articles on a given topic, all readable at a decent level of quality and unique as compared to any other content on the internet and I want all those things for less than 5 cents for all 20 articles and in less than a minute to prepare then I go for Article Builder. If I want...
Well, I do not have IAW.