When comparing DockbarX vs GNOME Do, the Slant community recommends DockbarX for most people. In the question“What are the best app launchers for UNIX-like systems?” DockbarX is ranked 10th while GNOME Do is ranked 19th. The most important reason people chose DockbarX is:
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.
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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 Plenty of plugins
By using the many available plugins Gnome Do can become a powerhouse of combined tools in one easily launchable and usable application.
Pro Themeable
Users can easily customize the looks of Gnome DO with the available themes in the settings of the app..
Cons
Con Not actively updated
Less than a dozen updates since 2014: https://github.com/M7S/dockbarx/commits/master
Con Has not been updated in a while
With the last update being dated Jan. 2014 development seems to be at a standstill.