When comparing CVS - Concurrent Versions System vs Bazaar, the Slant community recommends Bazaar for most people. In the question“What are the best version control systems?” Bazaar is ranked 7th while CVS - Concurrent Versions System is ranked 16th. The most important reason people chose Bazaar is:
It is quick to learn, you don't need to memorize lot of commands to do your job.
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Pros
Pro Simplicity
It is quick to learn, you don't need to memorize lot of commands to do your job.
Pro Tracking empty folders
With Bazaar you can track empty folders without the need to put .keep files in them.
Pro Full support for renaming
Renaming of a file is fully supported, not a hack like removing a file and adding back under another name...
Cons
Con Ancient and outdated
CVS is an ancient version control system that was a very useful tool back in the days, but a lot of progress has been made since then. Recommending CVS today would be like recommending typewriters instead of computers for writing.
Con Slow developement
Bazaar tends to have a slow update cycle with Canonical. Version 2.6 was released in August 2013 and branch 2.7 was not finished until Feb. 2016.