Retro Heart

To try to keep it as short as possible, for self-hosting, Wordpress has way more features, plugins, themes, and so on, which makes it easier to get into with little to no webdev experience. It does allow pretty decent customization, but also uses a database (I don't remember what kind off the top of my head) and the post editor can be frustrating to deal with unless they changed it again. I ultimately stopped using it because my site started to take 30+ seconds to load pages, and I could never figure out why. Plus the CEO (Automattic / Wordpress / Tumblr) is a dick.

Grav by comparison is a flat-file system where the content of individual pages is handled via markdown (there's also an Admin panel with an editor), and page layouts and settings are handled via YAML (which I'm still trying to figure out the specifics of). It doesn't use a database like Wordpress does, so in practice I can modify files locally with Notepad++, upload them to the site, and be done with it, though for testing things locally I use a program called Laragon. It does seem to expect more than a basic understanding of webdev and YAML, though I've been able to get by with various plugins to extend its functionality. Compared to Wordpress, it's also been lighting quick and should stay that way.