[RN7]

Briefly: Germany had very few technological clear cut leads over the Allies in WW2, and in industrial efficiency and the development of nuclear weapon they were well behind.

In ballistic and radio controlled missiles they where well ahead of the field, in fact the post-war US and Soviet missile and space programmes were largely based on German developments. In jet engines only Britain was even near them, but in other areas of aviation British and American aircraft technology matched or even surpassed them throughout the war, and in electronics and radars the British were probably ahead of everyone.

On land the larger German tanks were better armed and protected than anyone's expect for the Russians, but German tanks also had reliability issues. The allies also deliberately mass produced the Sherman and others because they were available and they could build them in huge numbers. If the M26 Pershing and Centurion had been available at D-Day in 1944 instead of 1945, they could have handled anything the Germans had thrown at them with ease.

At sea the Germans were probably behind Britain and America outside of submarine technology, and the only lead that Germany had was with certain submarine engine types and torpedoes and the technology was far from the finished article and British ASW countermeasures largely kept pace anything Germany developed.