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The Alaska-class vs The Scharnhorst-class. Both were uselessly overbuilt, under-gunned, and generally just a waste of resources, but lets say they meet in battle to the death. For our purposes, let's ignore their actual construction times/commissioning dates, and assume that all four are at their best in both readiness and improvements made post construction.
9x11", 38,000 tons full load, 31kts.
9x12", 34,000 tons full load, 31kts.