Quoted TextHe wanted our tanks to be modern cavalry, poking holes in the lines and exploiting the breakthrough. Patton also was a realist when it came to logistics. He knew the Sherman was only hampered by its fuel consumption. It was a mechanically sound machine that carried a fair amount of ammo. Plus, if you add another type of tank to the mix, you get the German logistic problems of too many varying types of chassises in the mix. Sherman was a common chassis that the US mechanics were working on when we used the M3 Lee.
Inshort, he thought the Shermen would be quicker & more manuverable in the European terrain. Thought the Pershing would be slower and heavier.