Arch for stuff I have physical access to. Nothing’s ever gone wrong, so it’s worth it for the immediate updates and consistency with my other systems. For VPS I use Debian though, occasionally the unstable/Sid branch if I really need the latest updates. There are almost always Debian images available on a VPS.

Forgejo is my go to, I ran it in a GCP micro instance, which has 768 MB ram and a piddling processor. One of my friends works for a company that had all their devs run a local instance in addition to the main repo, it was that light.

Gitea is the former go to, but gitea was hijacked and stolen from the community by a for profit company. Forgejo is currently a drop in replacement fork, but with added privacy features, future federation options, and a reputable parent organization.