I don't think this question is sufficiently well-defined to have a true answer. What does it mean to have/lack truth, what does it mean to have/lack happiness, and what are the extremes of both of these?
If I have all the happiness and none of the truth, do I get run over by a car that I didn't believe in?
If I have all the truth but no happiness, do I just wish I would get run over? Is there anything to stop me from using the truth to make myself happy again? Failing that is there anything that could motivate me to sit down for an hour with Eliezer and teach him the secrets of FAI before I kill myself? This option at least seems like it has more loopholes.
I admit this version of the question leaves substantial ambiguity that makes it harder to calculate an exact answer. I could have constructed a more well-defined version, but this is the version that I have been asking people already, and I'm curious how Less Wrongers would handle the ambiguity as well.
In the context of the question, it can perhaps be better defined as:
If you were in a situation where you had to choose between Truth (guaranteed additional information), or Happiness (guaranteed increased utility), and all that you know about this choice is...
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