Is the uptime any better?

Not really:

GitHub - Historically, GitHub reports uptime around 99.95% or higher, which translates to roughly 20–25 minutes of downtime per month. They have a large infrastructure and redundancy, so outages are rare but can happen during major incidents.

GitLab - GitLab also targets 99.95% uptime for its SaaS offering (GitLab.com). However, GitLab has had slightly more frequent service disruptions compared to GitHub in the past, especially during scaling events or major upgrades. For self-hosted GitLab instances, uptime depends heavily on your own infrastructure.