When comparing Moom vs Amethyst, the Slant community recommends Moom for most people. In the question“What is the best window manager for Mac?” Moom is ranked 1st while Amethyst is ranked 5th. The most important reason people chose Moom is:
Moom comes with many preset keyboard shortcuts. The user can go into the graphical settings of the app and change any one of them to a different combination of keys.
Specs
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Pros
Pro Customizable keyboard shortucts
Moom comes with many preset keyboard shortcuts. The user can go into the graphical settings of the app and change any one of them to a different combination of keys.
Pro You can save tiling window position and size
Users can set window position and size themselves, allowing for a great way to set up a tiling window experience.
Pro Windows can be snapped to the edges of the screen
In addition to using the grid or the overlay, Moom can move and zoom windows by dragging them to screen edges.
Pro Simple customization
While you can set keyboard shortcuts, Moom has a very easy-to-use GUI and GUI-based customization features to help you get going right away.
Pro Adds a zoom button for all apps
Moom adds an overlay zoom button to the corner of all apps which allows any app to go full screen or be placed to certain sections of the screen (such as the top, bottom, or sides). This works even on apps that do not normally allow for full screen views.
Pro Multi-monitor support
Moom has excellent support for multi-monitor setups. You can drag a window to the edge of your screen into another monitor and snap it there.

Pro It's free and open-source
Amethyst is published under the MIT license making it open-source and id offered completely free. This allows anyone to give the tiling window manger a try, which is great.

Pro Recently updated and rewritten in Swift.
The application was written in Objective-C, but was recently updated and completely rewritten in Apple's new native language Swift.

Pro Works with keyboard shortcuts, no mouse needed
As it's designed to work closely to how xmonad, Amethyst uses keyboard shortcuts to control the windows being used, meaning no mouse input is necessary. This can make for a faster way to control windows.
Pro Multi-monitor suppport
Pro Has many common layouts to choose from (fullscreen, floating, row, column, wide, etc)
Pro Can switch between tiling and floating mode
Pro Under active development
Pro Configured via UI
No CONFIG file provides security and will avoid making amethyst crash. Instead configured via simple UI
Pro True tiling means never losing track of windows under a huge pile of others
Cons
Con UI for settings can be confusing
The settings for the app are pretty jumbled and are hard to get a grip of, especially for first time users. While all the settings one would need are there, they are difficult to find or understand, which requires a good bit of playing around with the settings in order to get a feel for them and what they offer.
Con Not free
Moom is not free: it costs $9.99.
Con Non customisable popover
The pop over is not customisable and has two presets which are odd for instance two presents are two split windows horizontally.
Con Two steps needed, while some tools only need one
Con Can be buggy at times
Con There are more user friendly window managers available
There are certainly more user friendly window managers available for MacOS, such as Divvy or Moom. Amethyst, however, is more powerful and customizable than the more user friendly options available and therefore may be a better choice for a user looking for more advanced capabilities and customization.
