I'm going to suggest the GBA version for translation, cause the localization is really good. The only scene censored is the jail scene and that was due to world events at the time but the rest of the game is mostly uncensored with the exception of a few sprites (which is censored in most versions of the game). The game also has extra content like four new summons and the Dragon's Den dungeon. The downside to all this is the backgrounds for battles were spliced up a bit and the music quality isn't as strong as it usually is which is not a good thing for this game.

Because of that, I would recommend the ROM version. I'm a snob when it comes to translations and after playing the GBA version, I can't go back to the Woosley Script of the SNES/PS1 so the ROM wins out there. This version also doesn't suffer the downgrade in music quality or some of the minor splicing of the GBA version but it does lose out on the extras which I must say are well implemented into the game.