The best estimates of individuals killed by coalition forces is 35,000. The British study cannot certify what percentage of those individuals were killed by terrorist or coalition forces. This stands in contrast to the bogus Lancet study from 2003 estimating 100,000 deaths.
Saddam Hussein and his henchmen killed roughly 1.5 million people. This breaks down to 300-800 thousand in genodical extermination of kurds and shias. One million people were killed in the Iran/Iraq war initiated by Saddam.
It is interesting that you never hear the left concede that in Saddam's current status (i.e. absence from power) there are people now alive who would otherwise have been victimized and probably brutally murdered were he left in his former role as ruler of Iraq. The question of how many, of course, would only be a guess, but it seems reasonable that the guess would be based on his history. As I understand it, beyond Saddam's war with Iraq, his biological attacks on his own people, and his invasion into Kuwait, his despotism also lead Iraq to a decade of sanctions and UN fraud contributing to a high percentage of severe poverty among his civilian population.