Any.do is best for routine tasks whether personal or professional in nature. It is a simple app that organises your routine. It is not suitable for complex project management. You can streamline your daily routine and plan activities using this app. It will remind you of your tasks so that no task get’s missed.
I think Remember the Milk is a great tool for managing tasks and information. However, it depends on what the person is looking for. If you are looking for just a simple task management tool without any bells and whistles, this may be a lot, as it has a lot of advanced features (and even more if you go pro). If you are looking for a more robust task management tool with the option to add priorities, tags, categories, and assign tasks to others, this may be more suited for this. It is also helpful for managing lists like shopping lists or project lists.
It is very very intuitive, I have been using the app since it was launched, started using it as a personal reminder, and then also recommended within the organization. The experience is very similar to writing on a pad and then when complete crossing it off. I love it's user experience.
Any.do has a key selling point for me and is the AI integration to read through your tasks and suggest calendar events, also user interface in the mobile app is quite friendly and comfortable for users. I like that it has a different option for grocery lists, it helps me integrate work with personal life.
Google Tasks is a much simpler task-keeping interface, and I use it for the most important tasks on my phone. It does not offer tags, priorities, or distinguish between lists/tasks. It does let me star tasks, but does not let me determine the priority levels. I can also move tasks to different lists, but they can be hard to manage if there are too many, so I generally do not use this feature. For me, Google Tasks is ideal for very simple "I need to write this down" type tasks that are of high priority. It is not a good brain dumping tool because tasks can easily get lost. This is more for those nagging tasks that I want to do and make sure there is an appropriate alarm for. It also integrates well with my Android home screen. However, when I have lots of tasks I want to categorize, or I do want to do more of a brain dump type thing, I think Remember the Milk is far better. I can have more control over priorities, tags, assigning tasks to others, and other robust features.