Yes, because if everyone lives, there is a post-credits scene in which the person who I got killed appears...a fate worse than death, and it is not pretty. Nor is his death though if you do get him killed as I did, as Hannah looked like she had pleasure doing the deed, or rather, no reaction at all, I'm not sure. I don't know how I saw her emotions during that part, but it felt different. I'm eventually going to do a savegame in which I'll save everyone and one in which I'll kill everyone to get the platinum trophy, anyway. I'm guilty of restarting to save Sam as well, haha. But to answer your question, yeah, the best ending was the one I got.