The three listed use git as their interface and back-end. Now, they all lock you in their own issue and release tracker. I would go with github, just because i

The three listed use git as their interface and back-end. Now, they all lock you in their own issue and release tracker. I would go with github, just because it's pretty much the industry standard (some OSS projects moved to gitlab but keep a mirror on github just because there's so many users and it's where people expect to find the official repo).