Warspite and Malta fill different gaps in British museum preservation

Which lost or unbuilt British capital ship would make the most valuable museum?

Warspite for a pre-1945 choice, because she represents both world wars; a Malta-class carrier is the attractive postwar option.

A Malta-class carrier is the preferred post-1945 museum choice. It would preserve a substantial British carrier and create space to display aircraft with it. For a pre-1945 choice, Warspite takes priority. Her service across both world wars would fill the conspicuous absence of a preserved British battleship from that period.