When comparing DockbarX 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 DockbarX is ranked 4th.
Ranked in these QuestionsQuestion Ranking
Pros
Pro Great plugin to help blend in to XFCE4 panel
DockbarX has an available plugin called "DockBarX Xfce4 Panel plugin" that allows DockbarX to blend in seamlessly with the XFCE4 panel, which is great for XFCE users due to the limited options of the default panel.
Pro Easily customized
DockbarX has inbuilt settings that allow the user to easily customize the look of the dock, from changing the text color to the background color.
Pro Easily the best Win 7 taskbar functionality
If you want a combined launcher/manager, a la Win 7, this is it.
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 Not actively updated
Less than a dozen updates since 2014: https://github.com/M7S/dockbarx/commits/master
Con Configuring can take time
Configuring polybar can be time consuming.
Con Weird to configure
Hiding the Unicode symbols is tricky.