I think the answer for you is Dreamweaver.

Xara Web Designer 6 and the other Xara products are WYSIWYG products. They are not intended for third party editing.

If you know Dreamweaver then I would continue to use it.

Use Web Designer to design components for your sites which is an excellent use for ED6 and then bring the components into Dreamweaver.

I use Designer 6 Pro for about 99% of my website design. But I do not have clients who want to or need to edit my work. Nor would I want a client who wanted to edit my work. I am funny that way.

If your choice is between Web Designer and Menu Maker, I would go with Web Designer.