Which navy is happier if the Royal Navy and US Navy exchange their fleets in 1927?
Short answerThe US Navy, because Britain's ships fit a global fleet more readily than American ships fit British strategy and carrier practice.
NotesTiming matters because Lexington and Saratoga do not commission until late 1927; an earlier swap could leave Britain with only Langley as its inherited carrier. Even after receiving the Lexingtons, the Royal Navy would remove their 8-inch batteries and adapt them to British aviation practice. A later answer explains that the Royal Navy disliked carrying heavy guns high on a carrier because of their weight, reinforcing that immediate alteration. More broadly, American ships were built for American strategic geography rather than Britain's worldwide trade protection and base network. The US Navy would gain a force closer to the one Britain had designed for global presence, while the Royal Navy would begin a rapid replacement and conversion program.