Since GitHub is the "default" choice for a lot of people, it might offer more visibility to your projects.
I think the big advantage of GitLab (and some others such as Gitea) is the possibility to self-host and have unlimited private repos, so unless you need those two things, GitHub should do the work just fine.
Another big plus that I personally really like with Gitlab is the integrated CI/CD system.
Also, the docker registry is nice, even if I don't actively use it.
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