Which model is better and why?
I'm oversimplifying the description of those two models to make it as clear as possible.
Presidential model (USA, Mexico, Argentina..)
The people directly elects the chief of the executive power, the President, who chooses the ministers, members of the Government. In a different moment the people elects the Parliament (called Congress in the US), that holds the legislative power; if the two chambers of the Parliament have the same powers and tasks, it deals with perfect bicameralism. Imperfect, if they are different.
Parliamentary model (UK, Germany, Italy)
The people directly elects its representatives, the parliamentarians who hold the legislative power. The Parliament has to give its trust to a specific Government, whose chief is called Prime Minister (Kanzler in Germany), and who chooses the ministers. So a Government is "elected" by the majority of parliamentarians, who can form political coalitions to create a stable executive power.
Then there is a apolitical figure of constitutional control called monarch (in parliamentary monarchies like UK) or President (in parliamentary republics like Germany and Italy), but he\she has formal powers only.
Semi-Presidential model (France)
The people directly elects a president, the chief of the executive power who chooses his Government (Prime Minister and ministers). This Government must obtain the trust from the Parliament, directly elected by the people. It can happen that the Government, to whom the Parliament grants its trust, belongs to a different political orientation than the President. In this case, it deals with a situation called cohabitation , which is pretty rare btw.
I'm oversimplifying the description of those two models to make it as clear as possible.
Presidential model (USA, Mexico, Argentina..)
The people directly elects the chief of the executive power, the President, who chooses the ministers, members of the Government. In a different moment the people elects the Parliament (called Congress in the US), that holds the legislative power; if the two chambers of the Parliament have the same powers and tasks, it deals with perfect bicameralism. Imperfect, if they are different.
Parliamentary model (UK, Germany, Italy)
The people directly elects its representatives, the parliamentarians who hold the legislative power. The Parliament has to give its trust to a specific Government, whose chief is called Prime Minister (Kanzler in Germany), and who chooses the ministers. So a Government is "elected" by the majority of parliamentarians, who can form political coalitions to create a stable executive power.
Then there is a apolitical figure of constitutional control called monarch (in parliamentary monarchies like UK) or President (in parliamentary republics like Germany and Italy), but he\she has formal powers only.
Semi-Presidential model (France)
The people directly elects a president, the chief of the executive power who chooses his Government (Prime Minister and ministers). This Government must obtain the trust from the Parliament, directly elected by the people. It can happen that the Government, to whom the Parliament grants its trust, belongs to a different political orientation than the President. In this case, it deals with a situation called cohabitation , which is pretty rare btw.
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