As far as I can tell (please do post suggestions), there is no way of aggregating impacts on potential people you are creating.
Never-created humans have no experiences. Created humans have some experiences. Suffering is an experience. Created humans suffer more than never-created humans—infinitely more so. Whether the experiences of not-suffering outweigh the suffering in created humans is a different topic.
Never-created humans have no experiences. Created humans have some experiences. Suffering is an experience. Created humans suffer more than never-created humans—infinitely more so. Whether the experiences of not-suffering outweigh the suffering in created humans is a different topic.