When comparing ClearCase 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 ClearCase is ranked 15th. 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 Dynamic views
MVFS filesystem is a good approach for configuring a custom view to your files
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 File-centric
ClearCase is file-centric without UCM module
Con Slow
ClearCase is very slow
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.