You probably know what I'm gonna choose (and if not you don't know me). But I will always find Squall and Rinoa to be the best couple in FF, mostly because I find it the most realistically developed (Cloud and Tifa where the most realistically introuced) it takes it's time and doesn't feel too forced other than them not knowing each other too long from our POV (it is a media timeline) and that I really like the characters, they just seam perfect for each other, just really underated.