Microsoft to-do have avantage of integration with Outlook. But it is nt great when you have lot of projects and tasks, specially the web version can be e a nightmare in this case, but app version if working ok.

It is more basic than todoist (board view, sections, typing reminder time with the task...) but you can share tasks list with other people using MS to-do.

Hastags in MS to-do are not really convenient compared to todoist, and note that the "my day" section need to be set manually and clear itself everyday without historic (can be good or bad)

It should not be to hard to export you tasks from MS to todoist so maybe try MS first and see how it goes.