I'm replaying FFIII NES at the moment, and I may actually prefer the NES version over the 3D remake. The battles are much slower in the remake, even if there are less enemies and you use PSP's Auto-Battle feature for 2x speed. This is due to the very slow animations. I tried clocking how long one turn takes in the same location, and even with the PSP version having less enemies and Auto-Battle, the turns were faster on NES. The 3D version also felt much more grindy, or at least grinding takes a longer time. On NES, it took me about 25 hours hours to reach the Crystal Tower, and about 5 additional hours to grind for the final dungeons, and this was without the B-button Dash ability. On PSP, I needed 40 hours to reach the Crystal Tower, with about the same levels.

On my latest run, I've been using fan-made hacks, and I highly recommend them. Certain fan translations (such as the ones by ad0220 and Chaos Rush) add plenty of dialogue, as well as the B-button Dash ability. There also also mods, such as Maeson's Mix and Spindaboy's FFIII Patch, that rebalance the classes. With all these new changes, the NES version feels clearly superior to the 3D remakes, apart from graphics and music.