Christians, what is better ?

Doing good because you genuinely care. God does not judge you on what you do, if you help people all your life just to please God then that's not going to work. God judges you on what you believe. If you have killed a thousand people but genuinely believe in yourself that what you did was right and justified then you will be judged fairly. However if you know you have done wrong then you haven't a hope in hell of getting a ticket even if you just killed 1 person. Don't do something just to please God. He is not blind.