It depends on the use case. For something like birthday, ID expiration date, etc., just being able to type in the correct values is the best UI. But for a use c

It depends on the use case. For something like birthday, ID expiration date, etc., just being able to type in the correct values is the best UI. But for a use case like scheduling something in the near future (e.g. a flight, delivery, whatever), the calendar picker is superior because days of the week actually matter for this use case.