Both of us are far more familiar with GitHub than Gitlab, and so for our first big project together decided to go with what we know here instead of figuring out something new (there are so many new things we need to figure out, might as well reduce the number of optionally new things, lol). We aren't currently taking advantage of GitHub Actions or very many other built-in features (besides Dependabot) but luckily it integrates very well with the other services we're using.