Hermione
Yeah, that's just it, isn't it? On the one hand I understand the war back home a lot better than I do here and I feel more prepared to fight in it. On the other, there are plenty of people I care about here who are just as worth fighting for. So it's hard to say which would be better, for me.
At least back home you'd have a bit more time before the real war started. I know you and Harry and Ron went through a lot your first year and, okay, the next few years after that too but at least things weren't already so bad in the rest of the world yet.