Before I say anything, I'd just like to say that I don't think romantic equals a good love story. FFs IV and VI had some love story, but they weren't a big part of the game at all. FFVII had a triangular drama (although I think the fans make it bigger than what it really is with their Cloti vs. Cleris debates ) and some sweet and touching moments, but I don't think it was all that romantic.

FFVIII is the most romantic Final Fantasy, IMHO, and it's so romantic that it's also sappy at times, and occasionally it isn't all that believable, either. However, if you want romantic moments, this one is the way to go. A dance scene, saving the girl (several times), taking a tour around the school with her, going to a concert together, the main character realizing how important the girl is to him when (SPOILER)she goes into coma, the main character vowing the protect the girl from everyone and be her knight even if the world ends up hating her, hugging, kissing, holding hands... well, you probably got the point already.

FFIX has a great love story, although it's more subtle than the one in FFVIII, IMHO. There's not really kissing or holding hands, and there's no "Aww, I u 4ever!" moments, either. It's mostly a friendship style love story, with the two helping and supporting each other at hard times. FFX had some romantic moments between Tidus and Yuna, and some touching conversations, and with the PS2 quality graphics, you can also see some romantic moments when the two are looking at each other. There's also an underwater kissing scene that could be considered very sweet or plain disturbing. FFX-2's love story is based on the question whether the main character should let her lost love go or whether she can still find him again.

While FFX has its share of romantic moments, I still think FFVIII is more romantic, at least in terms of quantity. In terms of quality, however... well, you decide what you like, I guess. I'd also like to mention that I liked FFVIII's love story a lot when I was 14 and had a crush on a girl. FFIX's story felt better when I was broken-hearted, though.