I think Wagtail is better suited for sites that want a lot more control over the base HTML, page output and data models.

WordPress may be a bit directly comparable to https://www.coderedcorp.com/cms/

It's just a few extensions on Wagtail that let you get started with common page models for blogging and generic websites out of the box.

I often think of Wagtail as a framework for building your CMS, where as WordPress is a pre-built CMS.

Disclaimer: I'm on the Wagtail core team.