The best version of FF1 is probably still the first one. In my opinion anyway. But that's partly nostalgic factor and partly that I enjoy feeling like I'm playing 8-bit Theater

I have the remake and it just doesn't do it for me. The better graphics make me expect more, but its just prettier, still no substance, so its just weird

No opinion on #2 though from what I've gathered the DS versions of 3 and 4 are probably better

After that the Advanced versions are the best