I guess the FFX characters were a little more mature. With the "!!!!!"s in the little text bubbles taken away from the game, I think it gave the dialogue more realism, even if some of the voice acting was horrible. No one had tremendously hilariously huge boobs, no one moped and pined for someone (Yuna and Tidus wasn't my favorite romance, but it was nowhere near as annoying as Tifa refusing to help anyone in the group out except Cloud, or dropping out when he went missing). I guess the FF7 characters seemed, to me, overdone, too cartoony. Maybe that's expecting too much out of a video game, but I liked the FFX characters' subdued personalities much more, and found them more believable and likable that way.