The "alligator" is commonly used to teach that in schools. At least, thats how I learned it in third grade

Another reason why FFVII is popular is because it was also the first FF to be released worldwide. Many people had never heard of Final Fantasy before FFVII, so naturally it is very popular.

Anyway, it is hard to decide. Then again, the nostalgia factor places FFVI above anything...so I guess FFVI. It did start most of the trends that we think of as cliches in FF games. (Don't make me write a list..)

Though games before it(FFVI) helped shape what a typical FF storyline is today, it really defined it, condensed it. I hope this makes sense. Well, it should, to someone... Not to mention FFVI was pretty groundbreaking when it was released. FFVII too, on a worldwide scale. Both games were incredibly successful, where they were released. (And in FFVII's case, worldwide.)

So yeah, they were both very great games. I know I probably would only pick FFVI for nostalgia purposes anyway It also doesn't help that I love pretty much every FF. So FFVI, even though FFVI doesn't fall too far behind.