Hitler
Those brainy "not a single step back, defend to the last bullet" -orders, combined with the *brilliant* counterattacks at Kursk, Falaise, The Ardennes, Hungary etc etc sure gave Germany the upper hand in the strategic sceme...not
Combine the above with lots of small flashes of genius...such as "I want bomb racks on that jet fighter", "Halt before you get to the beach at Dunquirk", "Lets declare war on the us just because Japan did" or "We have certainly won the war now, switch production back to preacetime priorities"-in 1940 <-- my favourite...one month in 1940, cant remember which one, there were more pianos produced than the combined number of fighters and bombers...
Id say he is the given winner...