Which lost carriers would reveal the most naval history?

Which lost warship would provide the most useful historical evidence if it had survived?

An early carrier such as Furious, Saratoga, or Illustrious would fill a major preservation gap, with Furious especially valuable because of her many conversions.

The answer initially notes the value of preserving Hood or Yamato, then turns to the larger gap in early carrier preservation. It singles out Saratoga, Illustrious, and especially Furious, whose repeated conversions would let visitors trace changing ideas about flight decks and carrier operations on one hull. The answer frames preservation value around the design history a ship can physically demonstrate.