When to Use an Object: Against a Map, an Array of Pairs and a Class

Kenji is reviewing a pull request. It stores a bus company's seats three different ways in three files. One file keeps an object from a passenger's name to a seat. Another keeps a Map. A third keeps an array of [name, seat] pairs and searches it with find. All three work on the test data. Kenji has to say which one should stay, and why.