When comparing Gridsutra vs Amethyst, the Slant community recommends Amethyst for most people. In the question“What is the best window manager for Mac?” Amethyst is ranked 6th while Gridsutra is ranked 31st. The most important reason people chose Amethyst is:
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.
Specs
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Pros
Pro Good Adobe support
Gridsutra has Adobe support with the ability of stacking Adobe windows.
Pro Simple UI
The interface if Gridsutra is well thought through and easy to use.
Pro Window arrangement with a single click
Windows can be arranged or snapped in Gridsutra with a single click.
Pro Intuitive UI and delightful user experience
Pro A great tool for a reasonable price
Pro Highly flexible
Gridsutra works with most MacOS applications.
Pro Great drag and drop functionality
The drag and drop option in the layout gives freedom to the user for arrangement of any windows to any positions desired.
Pro Useful ignore/unignore feature
The ignore / unignore feature in Gridsutra allows the user to block unwanted applications to be listed in the layout option.
Pro Custom layout support

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 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.
