First one or else the second wouldn't be there. But technically whatever you choose to do, the future will end up the same way and your new past self will do the same thing. Confusing ain't it? I have put a lot of thought into this for the past years, if someone goes back in time to stop anything, nothing will happen no matter what you did because he future will always be the same. tl;dr The future will always be the same no matter what you do