Omnifocus vs RemindersPro

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.

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.

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.

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.

No need to sign up on some external website. Works out of the box.

Not proprietary, easy to switch back to the built-in iOS reminders.

It has workflows to automatically move and reprioritize reminders. And these changes will even be reflected in your iOS Reminders app. E.g. If you have a "Call" list and you say to Siri "Remind me to call mom" then it will automatically move it in there. Or you can set up a rule to move reminders containing your boss's name into your "Work" folder.