Is there a 'Western Front' bias here concerning Rommel?
To my mind, there is only one choice and he stands head shoulders above the rest!! That man is Fritz Erich Lewinski - who, more commonly known by his adopted family name of von Manstein.
To quote Richard Brett-Smith book entitled 'Hitler's Generals'
"Of all the candidates for greatness, to my mind one man stands out, and that is Field-marshal Erich von Manstein. He would have been acceptable to every general on the Eastern Front as commander-in-chief with total responsibility, and he was well liked and thought of by the men who served under him. Further, von Manstein was that rara avis, a man who combined the genuine intellual equipment and precision of the goood staff officer with the authority, decisiveness and imaginative flair of the good field commander. He proved himself to the hilt in both capacities; and if he made some mistakes, they were, few and not irretrievable ones. Von Manstein was the greatest German general of the war, and probably the greatest of any participating nation"
My second would be Guderian, my third would be Kesselring, next would be Colonel-Genral Erich Hoepner - as Brett-Smith says "thought by some to be even better than Guderian or Hoth"!
Perhaps, Rommel could be fourth before Hoth - in view of his longer service.