Which one is better kerry or Bush ?

Which one of these 2 American nomination is better for Iranians and Iran .
I remember from the first president of united stat that I identifed him (that was Ronald Reagan ) Iranians want in election resident president changed and always support opponent of president. it wasn't important that he was a republican or a democrat.
now most ordinary people in Iran hope that Kerry will elect as president cause they see Bush behavior against Iran but they don't experience Kerry. And if Kerry elect 2 years later I can guess that they start praying for next election to change president kerry.
Yes they don't know what is truth about Iran and U.S