prerogative vs upper hand

prerogative

• A property, attribute or ability which gives one a superiority or advantage over others; an inherent advantage or privilege; a talent. 

• A right, especially when due to one's position or role. 

• A hereditary or official right or privilege. 

• A right, or power that is exclusive to a monarch etc, especially such a power to make a decision or judgement. 

• Characterized by lawless state actions, as in a prerogative state. 

• Having a hereditary or official right or privilege. 

upper hand

• Advantage or control.