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I think you have to divide the period into early and late. The Do335 would be late late, like the Me262.
In 1939, when war broke out, my call would be the Bell P-39 Airacobra. Mid-engine. Tricycle LG. Canon through spinner. Electrics for most actuated devices (as opposed to manual or hydraulic. etc.
MM
P-43.
Too bad they didn't mount V-1710s 'stead of Twin Wasp.
I have been looking through my books and wondered what was the most innovative piston engined aircraft of WW2...
so it had a little armour plate do not see the comparisonWhat new concepts? Germany employed armored ground attack aircraft during WWI. Germany also employed aircraft cannon such as the 20mm Becker during WWI.
Junkers Aircraft of WW I
View attachment 179524
Junkers himself was not much engaged in the J4 design. He transfered the responsibility for this new aircraft to Dr. Mader, who was supported by Reuter, Steudel and Brandenburg, as well as by Madelung, who was sent to Dessau by the IDFLIEG. The principle ideas of the J3 design were transfered to the J4. The aircraft was designed with a Duralumin fuselage tube construction and the wings were constructed by corrugated Duralumin sheets and tubes. While the pilot's and oberserver's seat area were protected by a chrome nickel steel plate, the rear part of the fuselage tube construction was covered with textile coverings. The tail unit again was constructed in Duralumin structure.