I vote for Reagan for giving a politically popular voice to an asinine economic concept that, for some time, was the basis for winning presidential elections. Reagan effectively, and maybe proudly used the ignorance of the American public to push through his corporatist agenda. the arms race is also a factor.
Hate on the man that won the cold war?
Reagan didn't win the cold war any more than the Presidents preceding him dating back to Ike....
Iran-Contra (one of the largest scandals in our nation's history, that doesn't get the attention it deserves) among other things automatically puts Regan near the top of this list. But George W Bush wins this one hands down. Just a complete and utter failure.