Tall thin runners or short stubby runners are better?

I was curious because I see tall thin runners such as Robert Kipkoech Cheryiuot do awesome things, such as win the B.A.A. 4 times. But then I see a short and relatively stubby runner like Joan Benoit, who won the 1984 Olympic Marathon and has been running competetively for 5 decades. So which one is better? Or is there no perfect body for a runner?