When comparing Bazaar vs Vault, the Slant community recommends Vault for most people. In the question“What are the best version control systems?” Vault is ranked 5th while Bazaar is ranked 7th. The most important reason people chose Vault is:
For users needing more than source control, Vault Professional offers fully integrated work item tracking in a powerful, yet easy to use interface.
Ranked in these QuestionsQuestion Ranking
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...
Pro Fully integrated work item tracking
For users needing more than source control, Vault Professional offers fully integrated work item tracking in a powerful, yet easy to use interface.
Cons
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.