For the reader who wants a world behind a place
If the question that lingers after playing is how Eorzea’s city-states, cultures and professions fit together, Volume I is the stronger starting point. Square Enix’s English description foregrounds those subjects. It offers a reason to choose this particular book beyond wanting a substantial Final Fantasy XIV object on the shelf.
A reference book earns its place when it answers the question you repeatedly return to. Someone curious about institutions and ways of life has a different need from a reader pursuing a particular later region.
Volume II extends the map of interests
The second English volume is presented as newly compiled information, including the eastern lands. That gives it a distinct use for the fan whose attention is already directed there. Its number is not evidence that it supersedes the first book or contains every subject from it.
A sensible one-book choice can therefore begin with a subject: city-states and cultural foundations point toward I; an interest in the eastern material described by the publisher points toward II. Owning both may eventually make sense, but the official descriptions do not require buying them as an indivisible pair.
Choose the exact English objects
These are the 2022 English hardcovers identified by ISBN 9781646091423 for I and 9781646091430 for II. Matching that language and edition matters when comparing listings with similarly named publications.
Neither description establishes a continuously updated account of every subsequent game patch. A reader seeking the latest state of an ongoing storyline should not make a printed volume carry that burden. Choose it for the documented world-reference subject that appeals to you; keep current game questions separate from that lasting interest.
Sources & further reading
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