Which historical carrier most resembles Battlestar Galactica?

Which real aircraft carrier is the closest functional match to Battlestar Galactica?

A Royal Navy armored carrier such as Implacable best matches its balance of air power, protection, and fighting capability.

Galactica is best compared as a balanced aviation warship rather than by aircraft capacity alone. Lexington offers heavy guns but lacks the armor central to the fictional ship's endurance, while Japanese candidates are also judged too lightly protected. A Royal Navy armored carrier, especially Implacable, comes closest to the mix of air power, armor, and fighting resilience. The comparison shows why carrier designs cannot be ranked on air-group size alone.