When comparing ueli vs Plank, the Slant community recommends Plank for most people. In the question“What are the best app launchers for UNIX-like systems?” Plank is ranked 7th while ueli is ranked 17th. The most important reason people chose Plank is:
Plank is a good choice for those looking for something simple that just does its job well. There is no UI for options built in to the dock as to change anything those options will have to be accessed through a text file.
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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 Simple and minimal
Plank is a good choice for those looking for something simple that just does its job well. There is no UI for options built in to the dock as to change anything those options will have to be accessed through a text file.
Pro Solid and lightweight
Pro Third party themer available
An additional third party app has been developed that allows theming the dock without the use of any extra resources. This is great for those that are not using elementary OS and the elementary tweaks extra.
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 No right click menu for some apps outside of elementary OS
Other file explorers and terminals (those not found in the default elementary OS) do not have any right click menus for the dock meaning it is impossible to launch multiple windows for certain file explorers or terminals.
Con Poor workplace awareness (cycling windows)
When configured to only show apps on current workspace, cycling an app open on multiple workspaces will switch workspace focus, update the dock and often leave you to cycle another app.