Which class delivered more value in service: the Iowa class or the Queen Elizabeth class?
Short answerThe comparison is close, but the Queen Elizabeth class has a strong claim because it served through two world wars and in multiple major theatres.
NotesThe comparison is close, though the Queen Elizabeth class served through two world wars and across several theatres. The Iowas had a longer post-war life and remain valuable museum ships, but operational usefulness cannot be measured by survival alone. Different criteria can produce different answers to a seemingly simple "best class" question.