There's no useful comparison. Hitler was in command of a major world power in 1939-45. Saddam was in command of a battered and helpless shell of a beaten country in 2003 that was incapable of militarily threatening any of its neighbours in any serious manner. To compare them is, in my opinion, illogical and unrealistic in the extreme, but self-serving if you want to justify an illegal attack on Iraq in 2003, of course.

There's basically been no one on the world scene whom you could accurately compare to Hitler since 1945...although there would have been if Bush and Cheney had staged a coup, taken over the USA government in 2008, and run the place under a Republican Party dictatorship AND then pre-emptively attacked several more countries. THEN you would have something on the scale of Hitler to deal with.

Fortunately, they did not.