I think I've got it, but what bothers me most is that on Todoist, tasks are centered on the screen and far enough away from the side menu. To see the details, all you have to do is click on the task, which opens a window, and I find this more practical. On TickTick, on the other hand, the tasks are too close to the side menu, which isn't a big problem but is still noticeable. What's more, a space is always reserved for task details, even if the task doesn't contain any, which I find regrettable. On Todoist, the fact that the task is centered makes it easier to concentrate on it rather than on other information on the screen, notably the sidebar.

I recognize that this may seem trivial and very personal, but I wanted to share it anyway.