Helryx-Nui

This is a great version of FF6, and while it didn't have several features at launch it now has everything from console/PC versions. So controller support, classic and orchestral music, modern and classic fonts, the exp, encounter and gil boosts. There's very little to dislike about this version, it's very faithful to the original but uses the modern and far more accurate GBA translations. My main criticism is that it doesn't have the original music for the opera scene available, for reasons that are something of a spoiler, and that like all other PRs it lacks the bonus content from previous

It's the same fantastic game it was on the snes, with the new bits and pieces from the ds version and the cutscenes of the PlayStation port. It even comes with controller support. The major downside is that you're unable to adjust the language of the game, unlike for example the port of Secret of Mana, though I know for most people this won't be a huge issue.