When comparing DockbarX vs Ulauncher, the Slant community recommends Ulauncher for most people. In the question“What are the best Linux app launchers?” Ulauncher is ranked 5th while DockbarX is ranked 6th.
Ranked in these QuestionsQuestion Ranking
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 the best Win 7 taskbar functionality
If you want a combined launcher/manager, a la Win 7, this is it.
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 Supports extensions in Python
Pro Able to launch Kdialog, Zenity and Bash scripts
Extensions are easily created. Python script is all open to see. Not compiled like some.
Pro Supports fuzzy search
You can enter app name with a typo and Ulauncher will still be able to find it.
ULauncher supports themes and comes with a good supply on install but more can also be made.
Pro Allows custom shortcuts
Con Not actively updated
Less than a dozen updates since 2014: https://github.com/M7S/dockbarx/commits/master