Best version of FF2 is PSP for sure..
I'm ok with the individual job tweaks in FF3. It doesn't bother me that Sage and Ninja were overpowered in the original just as much as it doesn't bother me that jobs are generally more useful in the DS version... but I didn't like the stuff they added to stretch out access to game mechanics.
Job Adjustment Phase was retarded, imo.. I much rather preferred the Capacity system where you could change on the fly so long as you have CP. The only thing I might have preferred is if they allowed CP to accumulate higher.
Job levels were also unnecessary and added an extra layer of (exploitable) grind that didn't need to be there.
finally, its irritating to note that when they retconned the 4 main characters to have some kind of story, it was not consistent with the original story of the surface world being sealed off 1000 years.
edit: also, mognet. stupid idea. almost as bad as chocobo world ( FF8 ). is it so hard to keep single player games single player and not require social interaction to unlock content?