When comparing Quicksilver vs XtraFinder, the Slant community recommends Quicksilver for most people. In the question“What are the best power user tools for macOS?” Quicksilver is ranked 16th while XtraFinder is ranked 23rd.
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Pros
Pro Easy-to-understand noun-verb paradigm for creating tasks
Pro A lot more powerful than Spotlight
Pro Makes it really fast to do a lot of actions
There are customizable triggers and capability to execute multilevel commands - e.g. launch terminal app, give the location of script and supply parameters for the script with one command.
Pro Vast extensibility via plugins
A lot of different plugins for browsers, file systems, mail clients, etc.
Pro Free
Pro Old full-size color labels from OS X < 10.9
Pro Adds useful toolbar items
XtraFinder provides useful options for toolbar such as: Launch as Root, New Terminal Here, New File..., and Select...
Pro Additional right-click options
Xtra Finder provides additional options when performing the right click.
Pro Custom hotkeys
Pro Copy Path
Pro Can open a terminal in set position
XtraFinder can open up a terminal from the right-click menu in given path with "New Terminal Here".
Pro Dual panel
Split the Finder window into to windows to achieve better file handling.
Pro Colored icons in the Finder sidebar
Cons
Con Doesn't work on recent macOS versions without a workaround
This tool doesn't work on recent macOS versions, except if you try workaraound that may or may not work. It involves disabling System Integrity Protection and details on how to do it can be found on the XtraFinder website.