When comparing GTDNext vs ToDoList, the Slant community recommends GTDNext for most people. In the question“What are the best cross-platform task apps?” GTDNext is ranked 13th while ToDoList is ranked 17th. The most important reason people chose GTDNext is:
All the “Get Things Done” lists you would expect: next actions, someday, waiting, and scheduled.
Specs
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Pros

Pro GTD style lists
All the “Get Things Done” lists you would expect: next actions, someday, waiting, and scheduled.

Pro Automatic next actions
When it comes to choosing your next action, most to-do apps suffer from the same problem: All of your actions (sometimes hundreds in total) are visible to choose from. This can overwhelm users and cause them to give up on the system. GTDNext is different. In the "Next Action" view, only the very next action is shown for each of your projects. This results in a nicely consolidated view of only the things that need your immediate attention.

Pro Unlimited levels of projects and actions
In GTDNext you can set up an unlimited number of levels for your projects and actions, allowing you to plan your project and sub-projects in as much detail as needed.

Pro Areas of Focus
GTDNext supports the “Areas of Focus” methodology from Getting Things Done. You can filter all of your tasks to just show your work tasks, side project tasks, or personal tasks. There is also a global filter, so that when you’re hard at work you can focus only on your work projects and tasks.
Pro Option to visualize all projects and tasks in a single outline view
This is really useful because it prevents you from having to navigate through each project individually.

Pro Many keyboard shortcuts available
The number of keyboard shortcuts makes it easy to log or add tasks without removing your hands from the keys.
Pro Great functionality, lots of options
Cost, percent done, priority, you name it - you have it. If you prefer simple layout - no problem. You can configure everything.
Pro Configurable calendar view, day view, Gantt chart, Kanban
Plugins available for e.g. Kanban and MindMap.
Pro Comments with richtext format
It means comments can have different fonts, links to the pages or links to another tasks. You can format text your way.
Pro All features are free
Unlike many other to-do applications that have pricing plans to unlock additional features, all the features here are available for free.
Pro Multi-level subtasks
Pro Portable & lightweight
Default portable is 2.5 MB.
Pro You can set as many filters as many columns you have, as well as export your view or single tasks
Pro Dummy content (optional) included
Makes it easy to comprehend most features.
Pro Multi criteria sorting
Allows for sorting by 3 criteria. Missing in most task management apps.
Cons
Con No mobile app available
Con Web only
GTDNext does not have native apps for other devices, but it does work across PC/Mac/Linux on the web client.
Con No Google Tasks integration
Con Windows version startup too slow, on 1st time use
8G RAM, SSD, ToDoList Starting always takes 3-5 seconds to load, but if you go to settings and tune it to start with Windows and to minimize instead of closing, it will be instantaneous next time you use it.
Con Android app is in early stages still
Only the Windows version is fully-featured. The Android app is still in early development.
