Why Littorio was more efficient than Bismarck

Was Littorio a more efficient ship than Bismarck?

Yes, especially in its intended Mediterranean setting, although its specialization reduced its suitability for Atlantic operations.

Italy retained battleship design and modernization experience throughout the interwar period, giving its designers a more continuous development path than Germany's. Littorio was optimized for Mediterranean operations and would need changes such as an Atlantic bow for ocean service. Within its intended theatre, however, it is judged the Axis's most useful battleship pound for pound.