I'd suggest playing the GBA version. It's a bit more user-friendly than the SNES and PSX versions, and the translation is really well done. I didn't like FFIV's loading times on PSX, and both the graphics and sound seemed a bit weaker to me than on the SNES version. The Hard Type version for SNES with J2e's fan translation is pretty good if you can ignore the fact that the swearing is sometimes overused.