By "objectively better" I mean that given an ordering called "better", it is an objective fact that one state is "better" than another state. The ordering "better" is constructed from your own decision-making algorithm, you could say from subjective preference. This ordering however is not a matter of personal choice: you can't decide what it is, you only decide given what it already happens to be. It is only "subjective" in the sense that different agents have different preference.