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
As you look through these recommendations, keep in mind that source code storage will become in-scope for PCI DSS certification in the very near future.