Why Choose CVS?
1. GNU/Linux users already have it installed.
2. It is free, open source, mature and stable.
3. Many open source projects use it.
4. CVS's design works well with open source projects.
5. CVS is integrated into many Integrated Development Environments (IDE's) - for example all of the major Java IDE's have CVS integrated into them.
6. Cross - platform - GNU/Linux, Unix, Windows, Macs, Others
7. It is ubiquitous enough that the time you spend learning it will very likely be useful in other projects.