When comparing ShiftIt vs Breeze, the Slant community recommends ShiftIt for most people. In the question“What is the best window manager for Mac?” ShiftIt is ranked 2nd while Breeze is ranked 24th. The most important reason people chose ShiftIt is:
ShiftIt is configured through a simple UI where you simply press the hotkeys you wish to map to a certain action.
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Pros
Pro Easy to configure
ShiftIt is configured through a simple UI where you simply press the hotkeys you wish to map to a certain action.
Pro Free
Pro Intuitive
ShiftIt is very straight-forward to use for most frequent usages.
Pro Open source
Pro Configuration can be committed to your personal dotfiles repository
Configuration winds up living in .hammerspoon/init.lua and .hammerspoon/Spoons/ShiftIt.lua. Very easy to track configuration changes.

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.
Cons

Con A little slow
Similar to Spectacle, but it has a few more features, such as being able to pick the size adjustment increments. Spectacle was a little faster, though. Repeated size changes or moves in succession can cause it to wait for it to complete.

Con Imprecise when readjusting sizes
Con Doesn't support moving windows between workspaces
There's no way to move a window to a different workspace with hotkeys in ShiftIt.
Con No Adobe CC support
Adobe CC products do not respond to Breeze.
