The CMS space is incredibly crowded. The vast majority of WordPress websites would be cheaper, faster, and more secure if they were just moved to SquareSpace, which has the WordPress features that 99% of sites would need.

For more custom projects, I prefer the headless variety[1] because it makes sense to separate the data and presentation layers. That means you have the full ecosystem and flexibility of HTML/CSS/JS.

Ghost[2] was the first serious competitor I saw years ago. Gatsby is among the most popular these days[3].

But honestly, information sites should just use SquareSpace or something like it. There's no reason to maintain static site infrastructure at this point.

1. https://jamstack.org/

2. https://ghost.org/

3. https://www.gatsbyjs.com/

For enterprise level stuff, Drupal. Drupal development is a pain in the ass, but it's incredibly powerful, has a great community, and has a huge focus on security. But for the average blog/site, Drupal is overkill and too technical for what most people need

Wagtail [0]

[0] https://wagtail.io/