When comparing ueli vs DockbarX, 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 ueli is ranked 17th. 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 You can choose how deep into the launcher you want to go
Light or advanced user - both will have a positive experience.
Pro Doesn't keep annoying you with "I'm here!", "I can also do ... " pop ups
Pro It's easy to make scripts which can start all the programs you need for your task
Pro RESTART, HIBERNATE, SHUT DOWN or SLEEP at your finger tips - no screen needed
Pro You can quickly write system commands
Pro Execute command line commands directly
Pro Free and Open Source
Pro Everything compatibility
Pro Built-in translator
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.
Cons
Con The tray icon is only available in white
If you run the bright version of Windows, the icon is virtually not there.
Con Not actively updated
Less than a dozen updates since 2014: https://github.com/M7S/dockbarx/commits/master