What is his favourite German warship design?
Short answerHe has a soft spot for Scharnhorst and Gneisenau because they better suited Germany's strategic limits than a few very large battleships.
NotesGermany could not match British naval mass ship for ship, making speed and respectable numbers more useful than isolated giant ships. Scharnhorst and Gneisenau were more repeatable and strategically usable choices than Bismarck and Tirpitz. The River Plate comparison illustrates the difficulty of one powerful raider facing several smaller opponents. Individual ship specifications alone cannot establish a design's value to the fleet strategy.