I would have to go with the ME-262. When the allies concentrated on bombing german fuel supplies in mid-44 the Germans had more airforce/navy/mechanized army then they had fuel to deploy, so whatever super weapons they then had, no fuel, no use, no use.
I think the best super weapon for Germany would have been Albert Speer in charge of war production earlier and Hitler’s crazy commands not issued. By early 42 the German economy was not even on a war footing! The Nazis didn’t want women working in the factories, and the factories only ran on one shift! This well over a year after they lost the battle of Britain and they easy successes on the eastern front were all but over.
The allies had air domination by mid 43, yet German war production actually increased until mid-44. It was only until they began to lose France and the economies of the eastern territories that their war production went down. By then they had no fuel so it didn’t matter what they made.
By May 43 the ME-262 was ready for full production, Hitler didn’t trust the air generals at the time so he blocked production.
ugh, why does my screen jump all over now that I am one line below the text box……
http://www.2worldwar2.com/me-262.htm for a time line