I feel there are more reasons to use GitHub
There are a few more, but as I don't use GitLab that often, I'm not sure whether GitLab also has them
I'm very happy to read your comment. Marketplace is a very good point. I can't say something about UI because it's a personal mind. Take a look at Gitlab Pages.
I didn't realize Gitlab pages existed. Looking into it, I think I like it more than GitHub pages
AFAIK they don't support automatic HTTPS with Let's Encrypt (you have to upload your own cert and keep it updated).
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