Both, really. The game is about finding what you want out of life. Finding your purpose, or calling, if you can say that. And to many of the characters, they found that their purpose is to love, support and help the people around them. Here are some quotes from the game:

(SPOILER)
DAGGER: "You try to do everything by yourself, don't you?"
ZIDANE: "Try to understand... I don't want to cause trouble to anyone."
DAGGER: "Aren't we your friends?"
ZIDANE: "I want to think so! That's why I always... Look, I'm not from Gaia. I was just a hairsbreath from becoming the destroyer of Alexandria! I can't accept your friendship so easily!"
DAGGER: "You've always protected us. But you still don't understand that we looked out for you, too! We watched your back while you watched ours. And we believed in you the same way you believed in us! Just like you protected us... We want to protect you."
ZIDANE: "Dagger..."
QUINA: "You say it! My master tell me somebody give you tasties, you give them tasties, too. Is good manners! I still not cook you succulent frog yet, Zidane."
ZIDANE: "Quina..."
STEINER: "Chivalry requires a knight to look after his comrades-in-arms. I will not abandon you! And I shall follow you to kingdom come if I must. You remember that!"
ZIDANE: "Steiner... Ha... What am I gonna do with you guys?"
STEINER: "The feeling is mutual!"
GARLAND: "Zidane... I'll ask you one more time. Who are you!?"
ZIDANE: "You're a sad man, Garland... We know more than you... We're not perfect, but we have friends who help us. That is reason enough for us to live!"
NECRON: "I exist for one purpose... To return everything back to the zero world, where there is no life and no crystal to give life. In a world of nothing, fear does not exist. This is the world that all life desires."
ZIDANE: "Who the hell do you think you are!? You're not ending anything! Never, not as long as we have the will to live!"
NECRON: "Foolish creature... Your fears have already deluded you. One day, you will choose destruction over existence, as Kuja did. When he sought to destroy the crystal, the purpose of life ended. Now, come... Enter the zero world that you desire."
ZIDANE: "No! We'll destroy you and prove you wrong! And through our memories, future generations will see that we can overcome any fear! ... We can't give up now... We have to fight together. Even if we lose, it doesn't matter... Our memories will live on inside others. So, even if we are born to die, I'm not afraid. I'm gonna live!"