These two tools are aimed at very different users, but each will handle advanced authoring and let you decide whether to use their code or yours. Dreamweaver 1.2 is a pro-quality tool that has all the power and flexibility you could ask for. A quick click of Dreamweaver's External Editor button, and you're editing source code. Switch back to Dreamweaver, and it integrates your changes into the Wysiwyg view automatically.
Fusion takes a different approach.
It's a true Wysiwyg tool more akin to a desktop publisher than an HTML editor. Drag images, text, and other objects anywhere on the page and simply drop them in. Fusion uses nested tables and spacer GIFs to put them exactly where you want them. It also lets you insert untouchable code into pages, so you can tweak where you want and let Fusion handle the rest. Finally, we need to mention Elemental Software's Drumbeat 2.0 .