The pricing has changed recently, grandfathered in organisations have reasonable pricing (relative to GitHub) but the pricing for new organisations is much more expensive than GitHub. You can compare GitLab on features, but if you want to use those features the pricing is not comparable (GitLab's $100/user/m vs. GitHub's $21/user/m).
https://about.gitlab.com/blog/2021/01/26/new-gitlab-product-...