Large Conditionals in Static Factory Methods

Create a static factory method with the same parameters as the superclass constructor. It must contain the parameter that will take the starting values of the coded type. Depending on this parameter, the factory method will create objects of various subclasses. To do so, in its code you must create a large conditional but, at least, it will be the only one when it is truly necessary; otherwise, subclasses and polymorphism will do.

https://sourcemaking.com/refactoring/replace-type-code-with-subclasses

Refactoring is an Art

Which Choice should we work on first? Should we move logic to A first and then B, or B first and then A? How much do we work on one Choice before moving to the next? What about other refactoring opportunities we see as we go along? These are the kinds of succession questions that make refactoring an art.
Kent Beck