:shrug:
It's trivial to host yourself, and super light on resources. Personally, I don't use it; for blogging I write markdown and rsync it over to the server where Hugo picks it up and turns it into a blog. Now that I think about it, I should probably go shut my WriteFreely down. I have a few pages on it, but I hate web app interfaces, so I didn't put much content in it.
It depends on how you want to write. If you want to use a web interface, WriteFreely is decent. If you like your text editor, Hugo is fantastic.