When comparing MoveIt vs SizeUp, the Slant community recommends SizeUp for most people. In the question“What is the best window manager for Mac?” SizeUp is ranked 12th while MoveIt is ranked 21st. The most important reason people chose SizeUp is:
SizeUp has user-configurable keyboard shortcuts for a set of pre-defined actions.
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Pros
Pro Simple to understand window actions
Pro Can change keybindings easily
...as long as you are good with a text editor and know lua.
Pro Simple code that can be modified to meet your needs
Pro Lua based code and configuration
Code and configuration can be captured in personal dotfiles repo.
Pro Build on hammerspoon
Pro Keyboard centric
SizeUp has user-configurable keyboard shortcuts for a set of pre-defined actions.
Pro Supports multiple monitors / spaces
Windows can be sent to different monitors and spaces. It can also be aligned as needed.
Pro Simple
SizeUp is easy and simple to use without having to configure.
Pro AppleScript support allows extending functionality
AppleScript permits adding features such as tiling all open windows. Additionally, FastScripts it allows the user to add keyboard shortcuts to AppleScripts.
Pro Menubar dropdown for shortcuts
Learning a bunch of keyboard shortcuts right off the bat may be difficult to remember at first, which is why a menubar shortcut for the app exists with all the shortcuts listed.
Cons
Con Must be familiar or willing to learn Lua to customize
Hammerspoon-based applications require knowledge of text editing and the Lua programming language.
Con Nag window
If a license is not purchased there is a nag window (which suspends function) that pops up when loading the app (at user login). The nag pop-up is also summoned at certain time intervals and by performing a certain number of commands (manually or by keyboard shortcut).
Con No on-the-fly split screen window settings
Unlike some other tiling window managers, SizeUp has no way to change the size of split screen actions on-the-fly. Any time a user wants to change how much room on the screen a window takes up when using the split screen function, they will need to manually change the settings, which can be time consuming.