When comparing Docky vs Polybar, the Slant community recommends Polybar for most people. In the question“What is the best panel/dock for Linux?” Polybar is ranked 2nd while Docky is ranked 5th.
Ranked in these QuestionsQuestion Ranking
Pros
Pro Panel mode
For those that do not like the OSX dock look there is also a panel mode included that pushed the apps to the left side of the panel and elongates the dock to fill the entire bottom of the screen, just as a regular OS panel would.
Pro Drag and drop apps to the dock
Users can easily drag and drop apps to the dock for easy launching. Any app that is added will stay on the dock until removed manually. This makes for a great way to have all of ones most used apps in one place.
Pro Many themes
There are several themes installed with the dock by default that aare easily switched in the settings. What is even better is that there are many themes available online for download as well. With the best part being thatt he themes are simple .svg files that are easily editable in Inkscape to customize to how one wants.
Pro Highly Customisable.
Pro Plugin Docklets
Docky provides simple applications that run inside of the dock such as a clock, weather forecaster and CPU monitor. These provide an easy way to see information without having to open up separate apps.
Pro Feature rich
Pro Good design
It has a good example design which makes it really good.
Pro Eye candy themes
Pro Configuring doesn't need to be hard
Many configs can be found on the internet,
Cons
Con Removing Docky icon is not as easy as it should be
gconf editor is required in order to remove the Docky icon from the dock, which seems unnecessary as the setting exists, it should be in the app settings instead of hidden away in gconf.
Con Configuring can take time
Configuring polybar can be time consuming.
Con Weird to configure
Hiding the Unicode symbols is tricky.