4 or 7. One thing that bugs me about the older FFs (yes, even 4 as much as I like it) is how you're forced to accept things with minimal plot and character development. Relationships especially. 7 was the first one to really expand on that sort of development so I do like my two favs for different reasons. Also, I don't think 7 has the best particular anything, it's just the best overall package in my eyes.