"Incapable" vs "unable": what's the difference?

What is similar?

Both "incapable" and "unable" describe a lack of ability or capacity to do something. They are adjectives used to indicate that someone or something cannot perform a specific action or function.

What is different?

"Incapable" often implies an inherent or intrinsic lack of ability, suggesting a more permanent or characteristic inability. "Unable" is typically used to describe a temporary or situational lack of ability due to specific circumstances.

Which one is more common?