Some features that you should consider:
- Open source:
Google: Always open source.
Git: Open source for free account, but you can pay to switch to close source.
- VCS: Both google & github support Git (and others)
- Wiki: Google wiki is poorly supported, unless you love to write with wiki tags. You can find many project in Google project hosting has there wiki in Git hub.
- Statitstics: Github provides many nice statistics chart, while Google provides only a list of updates
Git:
Google:
