When comparing Breeze vs KWM, the Slant community recommends KWM for most people. In the question“What is the best window manager for Mac?” KWM is ranked 18th while Breeze is ranked 24th. The most important reason people chose KWM is:
For those who would like the same tiling window management of Xmonad and i3.
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Pros

Pro Simplicity
In Breeze, the user can very quickly assign pre-set window positions to hot-keys, although there are not many advanced hot-key options.
Pro Ease of use
The following are number of benefits of using Breeze:
- It's super simple to setup.
- It focuses on basic window management.
- It works with Spaces.
- "Nag" mode cab be used indefinitely.
Pro Runs in the menu bar
Breeze lives in the menu bar and there are no windows to clutter my UI.
Pro Works in the same way that Xmonad & i3 does for Linux
For those who would like the same tiling window management of Xmonad and i3.
Pro Runs in the background
The application runs in the background. There is no indication that it is running except the automatic tiling of the windows. There is no menu bar icon or icon in the dock.
Pro Windows respond very fast
Most users claim the tiling and splitting of the windows in KWM respond more quickly and more reliably than the only other known window manager of its type: Amethyst.
Pro Software is free and open source
Pro Highly configurable
Using the config file (kwmrc) you can configure a variety of options including Window spacing and padding, borders, hot-key commands, etc... There are those who would say that the possibilities are limitless.
Cons
Con No Adobe CC support
Adobe CC products do not respond to Breeze.
Con No longer being developed
Sadly the developer has moved on to work on a different project (chunkwm), so there will be no more updates for KWM. However the code works well; no matter what version of macOS you are using.
Con Takes long to set up
You need to use the terminal and edit the configuration file in order to adjust it to the way you want. This might be a little confusing for basic users. But once you have it set, you can just copy the config file and use it on a multiple amount of machines.
Con You need HomeBrew to install it
Homebrew is required to install it. Takes more to get it work in the terminal to get it installed and working on your system.
