FFIV had much better characters and a better story in my opinion, even though the graphics weren't so great, but it came out in the early 90's, so you can't expect too much. Rydia is probably one of the best FFs girls ever, at least in my opinion. FFVI and FFVII are said to be the best of them all by most people. Terra's story in FFVI was really interesting and FFVII had quite a moving story. All of the FFs are good, but most of them you will find have better stories and characters than FFX even though FFX's graphics were good (though I may think that because Yuna annoyed me and the game mostly revolved around her). Just my opinion though.