When comparing Google Tasks vs Omnifocus, the Slant community recommends Omnifocus for most people. In the question“What are the best cross-platform task apps?” Omnifocus is ranked 63rd while Google Tasks is ranked 69th. The most important reason people chose Omnifocus is:
Omnifocus allows users to setup the "defer date" which can be treated as "start date". Tasks will not be marked as available until that date, which should help to focus on the "available" task only.
Specs
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Pros
Pro Integration with Google Calendar
Google Tasks integrates with Google Calendar, consolidating your information in one place and allowing you to easily see which tasks have to be done on what day.
Pro Sync With Android
Pro Subtask lists
Each task can have a subtask allowing users to gradually break down a larger task into steps needed to accomplish it. When a user marks the parent task as complete, all subtasks inside that main task will also be marked as complete.
Pro Printable to-do list
Google Tasks allows users to print their to-do lists.
Pro Defer date
Omnifocus allows users to setup the "defer date" which can be treated as "start date". Tasks will not be marked as available until that date, which should help to focus on the "available" task only.
Pro Forecast summary
The forecast summary shows a quick digest of the tasks you have for the day. You can select any day to quickly see what tasks you have planned that day. For extra functionality you can connect with the iPhone’s Calender app, which allows you to also see any other events you have planned that day.
Pro See an overview of all tasks via "Perspective"
The Perspective section allows you to see an overview of the tasks you have set. It also allows you to set contexts or see things you have flagged.
Pro Nearby and context-sensitive tasks
OmniFocus 2 allows you to set up contexts for tasks in certain areas. This makes sure you never miss a task when you're out running errands and happen to be near something you need to do.
Cons
Con Inconsistent sorting when printing
You can start your tests online, but when you print it comes out differently.
Con Can print calendar or tasks but not both
If you want to see your day, you can see both your tasks and your meetings online. However, you cannot print it altogether as shown online. You have to print two separate things.
Con Mac and iOS only
Omnifocus doesn’t work on non-Apple platforms.