When comparing DockbarX vs Kupfer, 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 Kupfer is ranked 13th. 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 It's the fastest
Pro Quick launch with a shortcut
You can activate the launcher with a shortcut and write into it.
Cons
Con Not actively updated
Less than a dozen updates since 2014: https://github.com/M7S/dockbarx/commits/master