Which unbuilt carrier concepts were least worthwhile

Which ship from the unbuilt-carrier discussion most deserved not to be built?

The French PA6/PA9 alternatives offered the weakest case, while Chatfield's small carriers diverted effort from a more capable light-fleet design.

The French PA6/PA9 alternatives receive the least favourable assessment among the unbuilt carrier concepts. Most other proposals are considered defensible in some role. Chatfield's small-carrier work is also criticised for occupying design attention that could have matured a more useful light-fleet carrier sooner.