All around, I have to go with 10. But, I also like Tactics, 7, 12, and 8. In that order after 10.
8 is good, Squall is a G halfway through the game. He starts growing into a leader starting from being that quiet, apathetic kid. When he just goes after Edea when Irvine can't take the shot and when he saves Rinoa after the garden gets attacked
. But, then he turns emo and it goes downhill from there. How they all grew up in the same orphanage was some bullshit. Didn't really like the drawing/junction system either.