Should we always favor polymorphism over enums?

Question

After watching: The Clean Code Talks -- Inheritance, Polymorphism, & Testing

I checked my code and noticed a few switch statements can be refactored into polymorphis

Answer 1

class Sunday extends DayOfWeek {}
class Monday extends DayOfWeek {}
class Tuesday extends DayOfWeek {}
class Wednesday extends DayOfWeek {}
class Thursday extends DayOfWeek {}
class Friday extends DayOfWeek {}
class Saturday extends DayOfWeek {}

Enums are fine.