I have created a detailed list of requirements to choose a task/project management tool. Having a predefined list can help you find the best tool for you and evaluate new solutions as they are released. In no particular order:
- Solution has Mac & Windows apps with full features
- Supports the tenants of Getting Things Done methodology
There is only one application that has met all my requirements and that is Nozbe. I highly recommend Nozbe as it has been around for ten years. You can try Nozbe for free for thirty days right now!