It seems to me like a first idea that can be crossed off the list is that of life or death. Death feels too permanent, too definite in a world of such uncertainty to hold a place of value above life. And that would only be an important consideration if we had doubts about the value of living a life in the first place. Only for those with endless suffering do we tend to deeply question whether life is worth living. It seems like, generally, more life is better. I will take that as an assumption.