When comparing Zazu vs Avant Window Navigator, the Slant community recommends Avant Window Navigator for most people. In the question“What are the best app launchers for UNIX-like systems?” Avant Window Navigator is ranked 27th while Zazu is ranked 28th. The most important reason people chose Avant Window Navigator is:
AWN comes with a big selections of applets such as a CPU monitor or clock or trash bin. This means one can easily turn the docks functionality into that of a taskbar. There is even an app launcher applet that will group all of ones apps in one place just like a start menu.
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Pros
Pro It looks pretty
Pro Extensible
List of plugins: http://zazuapp.org/plugins/
Pro Free & open source
Pro File system search
Pro Look/feel like macOS's Spotlight
Pro Clipboard history
Pro Tons of plugins
AWN comes with a big selections of applets such as a CPU monitor or clock or trash bin. This means one can easily turn the docks functionality into that of a taskbar. There is even an app launcher applet that will group all of ones apps in one place just like a start menu.
Pro Easily customized
There is a wide array of setting available to theming and customizing the dock.
Cons
Con Finicky json config file without decent documentation on the process.
Con Tiny library of plugins
Con Inactive development
Con Project is dead
Has not been update since 2013 and has been already pulled from many repos. While it still can be installed and works as it did in 2013, no more fixes or features are expected.