qaccy
Emperor
I don't think it is possible to make straight comparisons on only the happiness aspect of GBs that are turning out different things besides the happiness. Are medals more use than goods, goods more useful than units, units more udeful than supplies - and if so, in what quantities? These things are subjective and dependant on many factors.
Notre Dame is directly comparable because it provides the same two benefits, so only the space and FP cost need to be looked at to draw conclusions.
You have a point, but I was only comparing the happiness values to begin with. It could be argued either way that Inno balances both bonuses together, or that they balance both bonuses separately. In the former case, that could explain why happiness values aren't entirely consistent but in the latter, Inno decided that all of the various collection aspects of each of these GBs are created equally. That is to say, gathering x amount of medals from an Iron Age Colosseum is equal to gathering x amount of troops from a Progressive Era Alcatraz. We can't really be sure which way Inno designed the bonuses, we can only speculate. To that end, I say the happiness values are inconsistent merely by virtue of the numbers on the Oracle.