I'm completely not objective, because FF1 is my favorite game of all time. All the classics are good in their own way. It depends on what you like about the newer ones. My favorite of the rest of 2-6 is 5, because of the fun story, exciting gameplay, and stellar job system. It was one of the tougher games for me to beat the first time through, because I didn't really know how to work the system well.