FFI is my favorite out of all of them. It was also my first, so go figure. I just have the most fun playing it and have beat it millions of times.

I liked FFV's magic system the best. It's pretty standard this class casts this type of spell once you're so high a level, but it's the first game that really got it perfect. For summons as well.

The combat systems are basically the same except for FFI.

Just for the heck of mentioning it I like FFIII the least out of all of them.