I have to switch between both of them, GitHub is my personal favourite out of the two, I'll use it for work and personal projects. However my university has an agreement with GitLab so we have to use that to submit our course work. I like the aspect of GitLab, but can find some of their interfaces are a little fiddly and takes a bit of time to get use to, especially that they allow private repos and organisation private repos for free straight away (with GitHub you have to pay)
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I have to switch between both of them, GitHub is my personal favourite out of the two, I'll use it for work and personal projects. However my university has an agreement with GitLab so we have to use that to submit our course work. I like the aspect of GitLab, but can find some of their interfaces are a little fiddly and takes a bit of time to get use to, especially that they allow private repos and organisation private repos for free straight away (with GitHub you have to pay)