I am a big fan of Guderian. But Manstein is Guderian on a much larger scale. His first great offensive achievement was the conquest of France which at the time had an army larger than Germany. Defensively, he was able to re-establish a line for Army Group South after the defeat at Stalingrad and the subsequent Soviet offensive.
Don’t forget Albert Kesselring. He drove us nuts in Italy. Made Mark Clark look like an amateur.