Silly argument. Ellington, Porter, Gershwin, Copland, Beethoven, Bach, Manilow , etc were doing different things and comparing this stuff is futile. Duke ain't the songwriter Porter or Gershwin were (though he wanted to be). He is not a composer of Copland or Beethoven stature (though he wanted to be). What he was is a superb jazzman with compositional and "arranging" talent and he changed my life.
This stuff really bothers me. We try to build ourselves up by "being better" than others rather than doing unique things.