When comparing AppTrap vs Better Touch Tool, the Slant community recommends AppTrap for most people. In the question“What are the best Mac OSX apps for someone that's new to Apple?” AppTrap is ranked 18th while Better Touch Tool is ranked 20th. The most important reason people chose AppTrap is:
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.
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Pros
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.
Pro Endlessly customizable
Pro Extendability
Allows user to extend my MBP with touchbar by creating custom actions per app. Also supports system-wide integration (touchbar actions).
Pro BTT makes it simple to sync your hotkey, Touch Bar and gesture setup between several machines
Pro Sync settings in the cloud
Pro There's a free companion app for iOS that you can use to remote control your Mac
Pro Supports Apple script, bash, javascript
Pro Customize window button behaviour
Pro Make your own menu bar items
Pro Active community
Pro Built-in clipboard manager
Pro Highly configurable window moving / window snapping options
Pro Key sequences
Supports key sequences for things like text expansion.
Pro Supports MIDI devices (keyboards, DAW controllers, etc.)
Listen for MIDI events and have them control anything. For example you could use a DJ controller in your favorite video editor, etc.
Pro Lets you configure your external mouse's 4th and 5th button per app
Pro Record gestures / drawings and assign them to actions
Pro Developer is regularly adding features / improvements
Cons
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.