On an operational level: Von Manstein (his plan for the invasion of France was brilliant) or Guderian
Tactically: Patton or Rommel
Sure Monty proposed the plan but the final blame HAS to be placed on “Boy” Browning, commander of the Allied Airborne forces. It was a major cluster **** from the get-go, but the crowning blunder was his total disregard of the Dutch underground and the Dutch officers in the Allied forces.