Frequently use both `github.com` and self-hosted Gitlab. IMHO, it's just... different.

Self-hosted Gitlab periodically blocks access for auto-upgrades. Github.com upgrades are usually invisible.

Github.com is periodically hit with the broad/systemic cloud-outage. Self-hosted Gitlab is more decentralized infra, so you don't have the systemic outages.

With self-hosted Gitlab, you likely to have to deal with rude bots on your own. Github.com has an ops team that deals with the rude bots.

I'm sure the list goes on. (shrug)