GitLab Pages are great
Over the past year or so I've been using GitHub Pages more for web-based projects I put on GitHub (and I wish more people deployed their HTML/CSS/JS-only repositories this way concurrently with sharing their raw code!), though I always felt like I wouldn't want to use or promote GitHub Pages for blogging efforts: I don't like to make the meta contents of such projects — the iteration of blog posts, drafts of new posts – public, and public repos are the default for free GitHub accounts.
This blog runs on GitLab Pages, which I only discovered while organising PyDays Vienna (the PyDays website lives on GitLab and uses Sphinx). And GitLab Pages have quickly become a new favourite way of hosting version-controlled static content which can be served via custom (sub)domain(s).