While NISA’s official translation is excellent, some hardcore fans argue that the fan translation retains certain Japanese honorifics (e.g., "Lloyd-san") and cultural nuances that the official localization softened. The Geofront script (which later became the basis for NISA’s release) was almost religiously literal in places.
If you are playing the fan translation and need a walkthrough, several spoiler-free guides are available: While NISA’s official translation is excellent