While historians still debate the topic, most would agree that Germany consistently fielded some of the best arms and armor in World War II. However, as the result of the conflict illustrates, superior weapons alone do not guarantee victory. American production capacity and Soviet resolve ultimately turned the tide.
Germany's chief problem was production capacity. While its tanks and planes were extremely well engineered, they were expensive to produce and difficult to maintain. One-on-one, a German Tiger II tank was superior to an American Sherman tank, but the United States could replace its losses much faster than the Germans could.
Ultimately, the Americans produced the most powerful weapon of the war, the atomic bomb, ending hostilities and changing the way wars would be fought thereafter.