What is a key difference between the government of Saudi Arabia and the government of Iran?

Unlike Iran, a single individual has most of the power in Saudi Arabia.
Unlike Iran, the citizens of Saudi Arabia have more power to participate.
Unlike Saudi Arabia, the government of Iran has strong local governments.
Unlike Saudi Arabia, the government of Iran is based around Islam.

Question

What is a key difference between the government of Saudi Arabia and the government of Iran?

    Unlike Iran, a single individual has most of the power in Saudi Arabia.
    Unlike Iran, the citizens of Saudi Arabia have more power to participate.
    Unlike Saudi Arabia, the government of Iran has strong local governments.
    Unlike Saudi Arabia, the government of Iran is based around Islam.