When comparing Moom vs SizeUp, the Slant community recommends Moom for most people. In the question“What are the best power user tools for macOS?” Moom is ranked 16th while SizeUp is ranked 58th. 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.
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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 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 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 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.
