If the past is any indication, no. GitLab Ultimate is $100/user/month whereas GitHub Enterprise with the Advanced Security addon is about $70/user/month. Well, at least Ultimate used to be $100 before they hid the prices from the pricing page. Could be even more for all I know. And yet, the base product you get isn't really significantly better than GitHub, and using it day-to-day professionally, has quite a lot of bugs too.