Both parliamentary and presidential democratic governments have three separate branches of government: executive, legislative and judicial. In a presidential democracy the president is a the head of state and is an elected figure. Generally the president's power is balanced by the legislative and judicial branches of government. In a parliamentary democracy, the legislative branch selects the prime minister. The prime minister is the head of the executive branch. Some parliamentary systems also have a president who serves as a head of state and holds less political power.
Based on the passage above, which branch of government has more power in a parliamentary democracy?