When comparing AppCleaner vs AppTrap, the Slant community recommends AppCleaner for most people. In the question“What are the best app uninstallers for Mac OS X?” AppCleaner is ranked 2nd while AppTrap is ranked 8th.
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Pros
Pro Easily and properly uninstall apps without leaving bits and pieces behind
Pro Saves a lot of room and cleans up your hard drive
AppCleaner does a much more thorough job removing unwanted applicated compared to the default method. This saves space and potentially speeds up your Mac.
Pro Simple, drag'n'drop app deletion
Pro Can whitelist certain apps
Pro Uninstalls widgets and plug-ins as well
Pro Prefpane style app
AppTrap installs a daemon that runs in the background monitoring the trash, when you drag an app to the trash it will search for associated .plist files that have been left behind and ask to move them to the trash. In other words, AppTrap launches and does the work for you automatically. All you have to do is uninstall apps the old fashioned mac way by dragging apps to the trash.
Cons
Con Closed-source
No source available. No open source license.
Con Not Supported in Big Sur
Con Gets some things, not everything
This is thorough enough in cleaning up most of the cruft that gets left behind by applications, but might not get everything for the more invasive applications, especially if some of the files have privileged permissions.
Con Requires using Finder
Does not work if you trash app using alternate file browser like Path Finder.