Iron Duke offered the steadier gunnery-training platform, but Tiger had greater value as an emergency modernization base. Her machinery had generally been operated below maximum output during the First World War, leaving it in better condition than a hard-driven wartime record might suggest. New boilers could have saved weight and supported about 30 knots, while four twin 14-inch turrets related to the King George V program could have replaced the older battery. A staged conversion through the training role might also have replaced casemate guns with modern 4.5-inch secondaries without displacing new construction from building slips.
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The case for preserving and modernizing Tiger
A counterfactual modernization with new boilers, 14-inch guns, and dual-purpose secondaries could have returned Tiger as a fast capital ship before World War II.