From what I can gather:
Site Sculptor - Builds the pages for you
CMS Builder - You build the pages and this just adds CMS to them therefore giving you far more control over look and feel.
Your friends over here at WebAssist! These Dreamweaver extensions will assist you in building unlimited, custom websites.
These out-of-the-box solutions provide you proven, tested applications that can be up and running now. Build a store, a gallery, or a web-based email solution.