We are changing our system. We settled on git (but are open for alternatives) as long as we can selfhost it on our own machines.
Specs
Must have
- hosted on promise
 - reliabile
 - unlikely to be discontinued in the next >5 years
 - for a group of at least 20 people
 
Plus
- gui / windows integration
 


If you don’t need CI/CD I don’t see any reasons to choose Gitlab over gitea. But I’m still testing gitea so take my words with a grain of salt :)
Gitea also has excellent CI support with builtin compatibility with github