In all honest, FFXIV: ARR is probably one of the best FF games I've played in a long time. It's more true to the originals than the last 4.
Being said, IV is still the best in the series. You don't manage your team. It forces you to change your play style and gives a lot more surprise in the story. Compared to 7, most of the characters in IV die or become extremely injured.
All the games after that give you all the characters immediately and basically let you take what you want. After 6, basically every character is in the game beginning to end.