I'm sorry for not specifying more. I'm interested in the part of the system that does the editing, not the theme for the site. The use case where the owner updates his site with new content.

In that case my vote absolutely goes with Drupal. Having the ability to define new content types and add/remove form fields (link list? add a URL field. Need an event? Add date fields, etc) as needed is huge.

Drupal also handles complex editorial workflows easily with the Workflow module, can support embargoed content, does simple content revisioning and provides limitless ways of organizing content.

But does it have a friendly interface for non-techies?

I think so provided we're only talking about adding, editing and deleting content. It's also worth noting that UX has been receiving a huge amount of attention with the Drupal 7 release and is an ongoing topic of serious interest among module developers.

I had a hard time over at Drupal.com finding screens of the interface the client is presented with when editing and managing content.

As a rule, if the CMS puts you away from your page and to a list of "posts" to edit with TinyMCE, it's not modern. Atleast in my book.

I'm not sure what screen you're referring to. Perhaps the admin content list? Typically content producers will add content via the "add content" link/button (depends on your theme), edits are possible from any screen where the content is displayed.

Drupal supports a number of rich text editors, TinyMCE is only one of them.

Could you give me a screenshot of editing in a page where content is displayed? Didn't find one on their site.

Ah, gotcha. Well, I have people in Marketing updating the CMS, if that tells you anything. :-)

Some stuff like "moving" pages confuses them, and I have to keep explaining that a page is really just a thin container for the template and a list of contents. Thankfully, that comes up rarely.

But how does Drupal do site editing interaction? A admin interface, or more in-context editing?